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  • 1. Allende Prieto, C
    et al.
    Barklem, Paul
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Asplund, M
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Ruiz Cobo, B
    Chemical Abundances from Inversions of Stellar Spectra: Analysis of Solar-Type Stars with Homogeneous and Static Model Atmospheres2001In: ASTROPHYSICAL JOURNAL, Vol. 558, p. 830-851Article in journal (Other (popular scientific, debate etc.))
  • 2. Allende Prieto, C.
    et al.
    Barklem, Paul
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Lambert, D.L
    Cunha, K.
    S4N: A Spectroscopic Survey of Stars in the Solar Neighborhood2004In: Astronomy and Astrophysics, Vol. 420, p. 183-205Article in journal (Refereed)
  • 3.
    Allende Prieto, C.
    et al.
    Inst Astrofis Canarias, Via Lactea, Tenerife 38205, Spain;Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain.
    Koesterke, L.
    Univ Texas Austin, Texas Adv Comp Ctr, Austin, TX 78759 USA.
    Hubeny, I.
    Univ Arizona, Steward Observ, 933 N Cherry Ave, Tucson, AZ 85721 USA.
    Bautista, M. A.
    Western Michigan Univ, Dept Phys, Kalamazoo, MI 49008 USA.
    Barklem, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Nahar, S. N.
    Ohio State Univ, Dept Astron, Columbus, OH 43210 USA.
    A collection of model stellar spectra for spectral types B to early-M2018In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 618, article id A25Article in journal (Refereed)
    Abstract [en]

    Context: Models of stellar spectra are necessary for interpreting light from individual stars, planets, integrated stellar populations, nebulae, and the interstellar medium.

    Aims: We provide a comprehensive and homogeneous collection of synthetic spectra for a wide range of atmospheric parameters and chemical compositions.

    Methods: We compile atomic and molecular data from the literature. We adopt the largest and most recent set of ATLAS9 model atmospheres, and use the radiative code ASS epsilon T.

    Results: The resulting collection of spectra is made publicly available at medium and high-resolution (R lambda/delta lambda = 10 000, 100 000 and 300 000) spectral grids, which include variations in effective temperature between 3500K and 30 000 K, surface gravity (0 <= log g <= 5), and metallicity (-5 <= [Fe/H] <= +0 : 5), spanning the wavelength interval 120-6500 nm. A second set of denser grids with additional dimensions, [alpha/ Fe] and micro-turbulence, are also provided (covering 200-2500 nm). We compare models with observations for a few representative cases.

  • 4.
    Amarsi, A. M.
    et al.
    Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany;Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
    Barklem, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Asplund, M.
    Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
    Collet, R.
    Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark.
    Zatsarinny, O.
    Drake Univ, Dept Phys & Astron, Des Moines, IA 50311 USA.
    Inelastic O plus H collisions and the O I 777 nm solar centre-to-limb variation2018In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 616, article id A89Article in journal (Refereed)
    Abstract [en]

    The O I 777 nm triplet is a key diagnostic of oxygen abundances in the atmospheres of FGK-type stars; however, it is sensitive to departures from local thermodynamic equilibrium (LTE). The accuracy of non-LTE line formation calculations has hitherto been limited by errors in the inelastic O+H collisional rate coefficients; several recent studies have used the Drawin recipe, albeit with a correction factor S-H that is calibrated to the solar centre-to-limb variation of the triplet. We present a new model oxygen atom that incorporates inelastic O+H collisional rate coefficients using an asymptotic two-electron model based on linear combinations of atomic orbitals, combined with a free electron model based on the impulse approximation. Using a 3D hydrodynamic STAGGER model solar atmosphere and 3D non-LTE line formation calculations, we demonstrate that this physically motivated approach is able to reproduce the solar centre-to-limb variation of the triplet to 0.02 dex, without any calibration of the inelastic collisional rate coefficients or other free parameters. We infer log epsilon(O) = 8.69 +/- 0.03 from the triplet alone, strengthening the case for a low solar oxygen abundance.

  • 5.
    Amarsi, A. M.
    et al.
    Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia..
    Lind, Karin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy. Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany..
    Asplund, M.
    Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia..
    Barklem, Paul S.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Collet, R.
    Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark..
    Non-LTE line formation of Fe in late-type stars - III. 3D non-LTE analysis of metal-poor stars2016In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 463, no 2, p. 1518-1533Article in journal (Refereed)
    Abstract [en]

    As one of the most important elements in astronomy, iron abundance determinations need to be as accurate as possible. We investigate the accuracy of spectroscopic iron abundance analyses using archetypal metal-poor stars. We perform detailed 3D non-LTE radiative transfer calculations based on 3D hydrodynamic STAGGER model atmospheres, and employ a new model atom that includes new quantum-mechanical neutral hydrogen collisional rate coefficients. With the exception of the red giant HD122563, we find that the 3D non-LTE models achieve Fe I/Fe II excitation and ionization balance as well as not having any trends with equivalent width to within modelling uncertainties of 0.05 dex, all without having to invoke any microturbulent broadening; for HD122563 we predict that the current best parallax-based surface gravity is overestimated by 0.5 dex. Using a 3D non-LTE analysis, we infer iron abundances from the 3D model atmospheres that are roughly 0.1 dex higher than corresponding abundances from 1D MARCS model atmospheres; these differences go in the same direction as the non-LTE effects themselves. We make available grids of departure coefficients, equivalent widths and abundance corrections, calculated on 1D MARCS model atmospheres and horizontally and temporally averaged 3D STAGGER model atmospheres.

  • 6.
    Amarsi, A. M.
    et al.
    Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.
    Nordlander, T.
    Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia;ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Canberra, ACT, Australia.
    Barklem, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Asplund, M.
    Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
    Collet, R.
    Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark.
    Lind, Karin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics. Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.
    Effective temperature determinations of late-type stars based on 3D non-LTE Balmer line formation2018In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 615, article id A139Article in journal (Refereed)
    Abstract [en]

    Hydrogen Balmer lines are commonly used as spectroscopic effective temperature diagnostics of late-type stars. However, reliable inferences require accurate model spectra, and the absolute accuracy of classical methods that are based on one-dimensional (1D) hydrostatic model atmospheres and local thermodynamic equilibrium (LTE) is still unclear. To investigate this, we carry out 3D non-LTE calculations for the Balmer lines, performed, for the first time, over an extensive grid of 3D hydrodynamic STAGGER model atmospheres. For H alpha, H beta, and H gamma we find significant 1D non-LTE versus 3D non-LTE differences (3D effects): the outer wings tend to be stronger in 3D models, particularly for H gamma, while the inner wings can be weaker in 3D models, particularly for H alpha. For H alpha, we also find significant 3D LTE versus 3D non-LTE differences (non-LTE effects): in warmer stars (T-eff approximate to 6500 K) the inner wings tend to be weaker in non-LTE models, while at lower effective temperatures (T-eff approximate to 4500 K) the inner wings can be stronger in non-LTE models; the non-LTE effects are more severe at lower metallicities. We test our 3D non-LTE models against observations of well-studied benchmark stars. For the Sun, we infer concordant effective temperatures from H alpha, H beta, and H gamma; however the value is too low by around 50 K which could signal residual modelling shortcomings. For other benchmark stars, our 3D non-LTE models generally reproduce the effective temperatures to within 1 sigma uncertainties. For H alpha, the absolute 3D effects and non-LTE effects can separately reach around 100 K, in terms of inferred effective temperatures. For metal-poor turn-off stars, 1D LTE models of H alpha can underestimate effective temperatures by around 150 K. Our 3D non-LTE model spectra are publicly available, and can be used for more reliable spectroscopic effective temperature determinations.

  • 7. Aoki, W
    et al.
    Frebel, A
    Christlieb, Norbert
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy. Theoretical Astrophysics.
    Norris, J
    Beers, T
    Minezaki, T
    Barklem, Paul
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy. Theoretical Astrophysics.
    Honda, S
    Takada-Hidai, M
    Asplund, M
    Ryan, S
    Tsangarides, S
    Eriksson, Kjell
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy. Theoretical Astrophysics.
    HE 1327-2326, an Unevolved Star with [Fe/H] < -5.0.: I. A Comprehensive Abundance Analysis2006In: The Astrophysical Journal, Vol. 639, p. 897-917Article in journal (Refereed)
  • 8.
    Babusiaux, C.
    et al.
    Univ Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France;Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    van Leeuwen, F.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Barstow, M. A.
    Univ Leicester, Dept Phys & Astron, Leicester Inst Space & Earth Observat, Univ Rd, Leicester LE1 7RH, Leics, England.
    Jordi, C.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Vallenari, A.
    INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy.
    Bossini, D.
    INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy.
    Bressan, A.
    SISSA, Via Bonomea 265, I-34136 Trieste, Italy.
    Cantat-Gaudin, T.
    INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy;Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    van Leeuwen, M.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Brown, A. G. A.
    Leiden Univ, Leiden Observ, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands.
    Prusti, T.
    ESA ESTEC, Directorate Sci, Sci Support Off, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands.
    de Bruijne, J. H. J.
    ESA ESTEC, Directorate Sci, Sci Support Off, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands.
    Bailer-Jones, C. A. L.
    Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.
    Biermann, M.
    Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany.
    Evans, D. W.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Eyer, L.
    Univ Geneva, Dept Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland.
    Jansen, F.
    ESA ESTEC, Directorate Sci, Operat Dept, Miss Operat Div, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands.
    Klioner, S. A.
    Tech Univ Dresden, Lohrmann Observ, Mommsenstr 13, D-01062 Dresden, Germany.
    Lammers, U.
    ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Lindegren, L.
    Lund Univ, Dept Astron & Theoret Phys, Lund Observ, Box 43, S-22100 Lund, Sweden.
    Luri, X.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Mignard, F.
    Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ,CS 34229, F-06304 Nice 4, France.
    Panem, C.
    CNES Ctr Spatial Toulouse, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Pourbaix, D.
    Univ Libre Bruxelles, Inst Astron & Astrophys, CP 226,Blvd Triomphe, B-1050 Brussels, Belgium;FRS FNRS, Rue Egmont 5, B-1000 Brussels, Belgium.
    Randich, S.
    INAF Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy.
    Sartoretti, P.
    Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    Siddiqui, H. I.
    ESA ESAC, Telespazio Vega UK Ltd, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Soubiran, C.
    Univ Bordeaux, CNRS, Lab Astrophys Bordeaux, B18N,Allee Geoffroy St Hilaire, F-33615 Pessac, France.
    Walton, N. A.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Arenou, F.
    Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    Bastian, U.
    Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany.
    Cropper, M.
    Univ Coll London, Mullard Space Sci Lab, Holmbury St Mary, Dorking RH5 6NT, Surrey, England.
    Drimmel, R.
    INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
    Katz, D.
    Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    Lattanzi, M. G.
    INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
    Bakker, J.
    ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Cacciari, C.
    INAF, Osservatorio Astrofis & Sci Spazio Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy.
    Castaneda, J.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Chaoul, L.
    CNES Ctr Spatial Toulouse, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Cheek, N.
    ESA ESAC, Serco Gest Negocios, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    De Angeli, F.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Fabricius, C.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Guerra, R.
    ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Holl, B.
    Univ Geneva, Dept Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland.
    Masana, E.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Messineo, R.
    ALTEC SpA, Corso Marche 79, I-10146 Turin, Italy.
    Mowlavi, N.
    Univ Geneva, Dept Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland.
    Nienartowicz, K.
    Univ Geneva, Dept Astron, Chemin Ecogia 16, CH-1290 Versoix, Switzerland.
    Panuzzo, P.
    Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    Portell, J.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Riello, M.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Seabroke, G. M.
    Univ Coll London, Mullard Space Sci Lab, Holmbury St Mary, Dorking RH5 6NT, Surrey, England.
    Tanga, P.
    Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ,CS 34229, F-06304 Nice 4, France.
    Thevenin, F.
    Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ,CS 34229, F-06304 Nice 4, France.
    Gracia-Abril, G.
    ESAC, Gaia DPAC Project Off, Camino Bajo Castillo S-N, Madrid 28692, Spain;Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany.
    Comoretto, G.
    ESA ESAC, Telespazio Vega UK Ltd, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Garcia-Reinaldos, M.
    ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Teyssier, D.
    ESA ESAC, Telespazio Vega UK Ltd, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Altmann, M.
    Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany;Sorbonne Univ, LNE, Univ PSL, Observ Paris,SYRTE,CNRS, 61 Ave Observ, F-75014 Paris, France.
    Andrae, R.
    Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.
    Audard, M.
    Univ Geneva, Dept Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland.
    Bellas-Velidis, I.
    Natl Observ Athens I Metaxa & Vas Pavlou Palaia P, Athens 15236, Greece.
    Benson, K.
    Univ Coll London, Mullard Space Sci Lab, Holmbury St Mary, Dorking RH5 6NT, Surrey, England.
    Berthier, J.
    Univ Lille, Sorbonne Univ, Univ PSL, Observ Paris,IMCCE, 77 Av Denfert Rochereau, F-75014 Paris, France.
    Blomme, R.
    Royal Observ Belgium, Ringlaan 3, B-1180 Brussels, Belgium.
    Burgess, P.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Busso, G.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Carry, B.
    Univ Lille, Sorbonne Univ, Univ PSL, Observ Paris,IMCCE, 77 Av Denfert Rochereau, F-75014 Paris, France;Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ,CS 34229, F-06304 Nice 4, France.
    Cellino, A.
    INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
    Clementini, G.
    INAF, Osservatorio Astrofis & Sci Spazio Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy.
    Clotet, M.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Creevey, O.
    Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ,CS 34229, F-06304 Nice 4, France.
    Davidson, M.
    Univ Edinburgh, Royal Observ, Inst Astron, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland.
    De Ridder, J.
    Katholieke Univ Leuven, Inst Sterrenkunde, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
    Delchambre, L.
    Univ Liege, Inst Astrophys & Geophys, 19c Allee 6 Aout, B-4000 Liege, Belgium.
    Dell'Oro, A.
    INAF Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy.
    Ducourant, C.
    Univ Bordeaux, CNRS, Lab Astrophys Bordeaux, B18N,Allee Geoffroy St Hilaire, F-33615 Pessac, France.
    Fernandez-Hernandez, J.
    ESA ESAC, ATG Europe, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Fouesneau, M.
    Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.
    Fremat, Y.
    Royal Observ Belgium, Ringlaan 3, B-1180 Brussels, Belgium.
    Galluccio, L.
    Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ,CS 34229, F-06304 Nice 4, France.
    Garcia-Torres, M.
    Univ Pablo Olavide, Area Lenguajes Sistemas Informat, Ctr Utrera,Km 1, Seville 41013, Spain.
    Gonzalez-Nunez, J.
    ESA ESAC, Serco Gest Negocios, Camino Bajo Castillo S-N, Madrid 28692, Spain;Univ Vigo, ETSE Telecomun, Campus Lagoas Marcosende, Vigo 36310, Spain.
    Gonzalez-Vidal, J. J.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Gosset, E.
    FRS FNRS, Rue Egmont 5, B-1000 Brussels, Belgium;Univ Liege, Inst Astrophys & Geophys, 19c Allee 6 Aout, B-4000 Liege, Belgium.
    Guy, L. P.
    Large Synopt Survey Telescope, 950 N Cherry Ave, Tucson, AZ 85719 USA;Univ Geneva, Dept Astron, Chemin Ecogia 16, CH-1290 Versoix, Switzerland.
    Halbwachs, J. -L
    Hambly, N. C.
    Univ Edinburgh, Royal Observ, Inst Astron, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland.
    Harrison, D. L.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England;Univ Cambridge, Kavli Inst Cosmol, Madingley Rd, Cambride CB3 0HA, England.
    Hernandez, J.
    ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Hestroffer, D.
    Univ Lille, Sorbonne Univ, Univ PSL, Observ Paris,IMCCE, 77 Av Denfert Rochereau, F-75014 Paris, France.
    Hodgkin, S. T.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Hutton, A.
    ESA ESAC, Aurora Technol, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Jasniewicz, G.
    Univ Montpellier, Lab Univ & Particules Montpellier, Pl Eugene Bataillon,CC72, F-34095 Montpellier 05, France.
    Jean-Antoine-Piccolo, A.
    CNES Ctr Spatial Toulouse, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Jordan, S.
    Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany.
    Korn, Andreas
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
    Krone-Martins, A.
    Univ Lisbon, CENTRA, FCUL, Campo Grande,Edif C8, P-1749016 Lisbon, Portugal.
    Lanzafame, A. C.
    Univ Catania, Dipartimento Fis & Astron, Sez Astrofis, Via S Sofia 78, I-95123 Catania, Italy;INAF, Osservatorio Astrofis Catania, Via S Sofia 78, I-95123 Catania, Italy.
    Lebzelter, T.
    Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria.
    Loeffler, W.
    Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany.
    Manteiga, M.
    Univ A Coruna, CITIC Astron & Astrophys, Campus Elvina S-N, La Coruna 15071, Spain;Univ A Coruna, CITIC, Dept Comp Sci, Campus Elvina S-N, La Coruna 15071, Spain.
    Marrese, P. M.
    INAF, Osservatorio Astron Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Italy;ASI, Space Sci Data Ctr, Via Politecn SNC, I-00133 Rome, Italy.
    Martin-Fleitas, J. M.
    ESA ESAC, Aurora Technol, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Moitinho, A.
    Univ Lisbon, CENTRA, FCUL, Campo Grande,Edif C8, P-1749016 Lisbon, Portugal.
    Mora, A.
    ESA ESAC, Aurora Technol, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Muinonen, K.
    Univ Helsinki, Dept Phys, FIN-00014 Helsinki, Finland;Finnish Geospatial Res Inst FGI, Geodeetinrinne 2, Masala 02430, Finland.
    Osinde, J.
    ESA ESAC, Isdefe, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Pancino, E.
    ASI, Space Sci Data Ctr, Via Politecn SNC, I-00133 Rome, Italy;INAF Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy.
    Pauwels, T.
    Royal Observ Belgium, Ringlaan 3, B-1180 Brussels, Belgium.
    Petit, J. -M
    Recio-Blanco, A.
    Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ,CS 34229, F-06304 Nice 4, France.
    Richards, P. J.
    Rutherford Appleton Lab, STFC, Harwell OX11 0QX, Didcot, England.
    Rimoldini, L.
    Univ Geneva, Dept Astron, Chemin Ecogia 16, CH-1290 Versoix, Switzerland.
    Robin, A. C.
    Univ Bourgogne Franche Comte, Inst UTINAM UMR6213, CNRS, OSU THETA Franche Comte Bourgogne, F-25000 Besancon, France.
    Sarro, L. M.
    UNED, Dept Inteligencia Artificial, C Juan Rosal 16, Madrid 28040, Spain.
    Siopis, C.
    Univ Libre Bruxelles, Inst Astron & Astrophys, CP 226,Blvd Triomphe, B-1050 Brussels, Belgium.
    Smith, M.
    Univ Coll London, Mullard Space Sci Lab, Holmbury St Mary, Dorking RH5 6NT, Surrey, England.
    Sozzetti, A.
    INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
    Sueveges, M.
    Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.
    Torra, J.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    van Reeven, W.
    ESA ESAC, Aurora Technol, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Abbas, U.
    INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
    Abreu Aramburu, A.
    ESA ESAC, Elecnor Deimos Space, Camino Bajo Castillo S-N, Madrid 28692, Spain;Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany;INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy;Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain;Univ Geneva, Dept Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland;Univ Liege, Inst Astrophys & Geophys, 19c Allee 6 Aout, B-4000 Liege, Belgium.
    Accart, S.
    CNES Ctr Spatial Toulouse, Thales Serv, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Aerts, C.
    Radboud Univ Nijmegen, Dept Astrophys, IMAPP, POB 9010, NL-6500 GL Nijmegen, Netherlands;Katholieke Univ Leuven, Inst Sterrenkunde, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
    Altavilla, G.
    INAF, Osservatorio Astron Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Italy;ASI, Space Sci Data Ctr, Via Politecn SNC, I-00133 Rome, Italy;INAF, Osservatorio Astrofis & Sci Spazio Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy.
    Alvarez, M. A.
    Univ A Coruna, CITIC, Dept Comp Sci, Campus Elvina S-N, La Coruna 15071, Spain.
    Alvarez, R.
    ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Alves, J.
    Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria.
    Anderson, R. I.
    European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany;Univ Geneva, Dept Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland.
    Andrei, A. H.
    Sorbonne Univ, LNE, Univ PSL, Observ Paris,SYRTE,CNRS, 61 Ave Observ, F-75014 Paris, France;ON MCTI BR, Rua Gal Jose Cristino 77, BR-20921400 Rio De Janeiro, Brazil;OV UFRJ BR, Ladeira Pedro Antonio 43, BR-20080090 Rio De Janeiro, Brazil.
    Anglada Varela, E.
    ESA ESAC, ATG Europe, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Antiche, E.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Antoja, T.
    ESA ESTEC, Directorate Sci, Sci Support Off, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands;Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Arcay, B.
    Univ A Coruna, CITIC, Dept Comp Sci, Campus Elvina S-N, La Coruna 15071, Spain.
    Astraatmadja, T. L.
    Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany;Carnegie Inst Sci, Dept Terr Magnetism, 5241 Broad Branch Rd,NW, Washington, DC 20015 USA.
    Bach, N.
    ESA ESAC, Aurora Technol, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Baker, S. G.
    Univ Coll London, Mullard Space Sci Lab, Holmbury St Mary, Dorking RH5 6NT, Surrey, England.
    Balaguer-Nunez, L.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Balm, P.
    ESA ESAC, Telespazio Vega UK Ltd, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Barache, C.
    Sorbonne Univ, LNE, Univ PSL, Observ Paris,SYRTE,CNRS, 61 Ave Observ, F-75014 Paris, France.
    Barata, C.
    Univ Lisbon, CENTRA, FCUL, Campo Grande,Edif C8, P-1749016 Lisbon, Portugal.
    Barbato, D.
    Univ Torino, Dipartimento Fis, Via Pietro Giuria 1, I-10125 Turin, Italy;INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
    Barblan, F.
    Univ Geneva, Dept Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland.
    Barklem, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
    Barrado, D.
    ESA ESAC, Dept Astrofis, Ctr Astrobiol, CSIC INTA, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Barros, M.
    Univ Lisbon, CENTRA, FCUL, Campo Grande,Edif C8, P-1749016 Lisbon, Portugal.
    Bartholome Munoz, S.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Bassilana, J. -L
    Becciani, U.
    INAF, Osservatorio Astrofis Catania, Via S Sofia 78, I-95123 Catania, Italy.
    Bellazzini, M.
    INAF, Osservatorio Astrofis & Sci Spazio Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy.
    Berihuete, A.
    Univ Cadiz, Dept Estadist, Calle Republica Arabe Saharawi S-N, Puerto Real 11510, Spain;Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany;Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Bertones, S.
    Sorbonne Univ, LNE, Univ PSL, Observ Paris,SYRTE,CNRS, 61 Ave Observ, F-75014 Paris, France;INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy;Bern Univ, Astron Inst, Sidlerstr 5, CH-3012 Bern, Switzerland.
    Bianchi, L.
    EURIX Srl, Corso Vittorio Emanuele 2 61, I-10128 Turin, Italy.
    Bienayme, O.
    Univ Strasbourg, CNRS, Observ Astron Strasbourg, UMR 7550, 11 Rue Univ, F-67000 Strasbourg, France.
    Blanco-Cuaresma, S.
    Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA;Univ Bordeaux, CNRS, Lab Astrophys Bordeaux, B18N,Allee Geoffroy St Hilaire, F-33615 Pessac, France;Univ Geneva, Dept Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland.
    Boch, T.
    Univ Strasbourg, CNRS, Observ Astron Strasbourg, UMR 7550, 11 Rue Univ, F-67000 Strasbourg, France.
    Boeche, C.
    INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy.
    Bombrun, A.
    ESA ESAC, HE Space Operat BV, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Borrachero, R.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Bouquillon, S.
    Sorbonne Univ, LNE, Univ PSL, Observ Paris,SYRTE,CNRS, 61 Ave Observ, F-75014 Paris, France.
    Bourda, G.
    Univ Bordeaux, CNRS, Lab Astrophys Bordeaux, B18N,Allee Geoffroy St Hilaire, F-33615 Pessac, France.
    Bragaglia, A.
    INAF, Osservatorio Astrofis & Sci Spazio Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy.
    Bramante, L.
    ALTEC SpA, Corso Marche 79, I-10146 Turin, Italy.
    Breddels, M. A.
    Univ Groningen, Kapteyn Astron Inst, Landleven 12, NL-9747 AD Groningen, Netherlands.
    Brouillet, N.
    Univ Bordeaux, CNRS, Lab Astrophys Bordeaux, B18N,Allee Geoffroy St Hilaire, F-33615 Pessac, France.
    Bruesemeister, T.
    Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany.
    Brugaletta, E.
    INAF, Osservatorio Astrofis Catania, Via S Sofia 78, I-95123 Catania, Italy.
    Bucciarelli, B.
    INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
    Burlacu, A.
    CNES Ctr Spatial Toulouse, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Busonero, D.
    INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
    Butkevich, A. G.
    Tech Univ Dresden, Lohrmann Observ, Mommsenstr 13, D-01062 Dresden, Germany.
    Buzzi, R.
    INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
    Caffau, E.
    Cancelliere, R.
    Univ Turin, Dept Comp Sci, Corso Svizzera 185, I-10149 Turin, Italy.
    Cannizzaro, G.
    Radboud Univ Nijmegen, Dept Astrophys, IMAPP, POB 9010, NL-6500 GL Nijmegen, Netherlands;SRON, Netherlands Inst Space Res, Sorbonnelaan 2, NL-3584CA Utrecht, Netherlands.
    Carballo, R.
    Univ Cantabria, Dept Matemat Aplicada & Ciencias Comp, ETS Ingenieros Caminos Canales & Puertos, Avda Castros S-N, E-39005 Santander, Spain.
    Carlucci, T.
    Sorbonne Univ, LNE, Univ PSL, Observ Paris,SYRTE,CNRS, 61 Ave Observ, F-75014 Paris, France.
    Carrasco, J. M.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Casamiquela, L.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Castellani, M.
    INAF, Osservatorio Astron Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Italy.
    Castro-Ginard, A.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Charlot, P.
    Univ Bordeaux, CNRS, Lab Astrophys Bordeaux, B18N,Allee Geoffroy St Hilaire, F-33615 Pessac, France.
    Chemin, L.
    Univ Antofagasta, Unidad Astron, Ave Angamos 601, Antofagasta 1270300, Chile.
    Chiavassa, A.
    Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ,CS 34229, F-06304 Nice 4, France.
    Cocozza, G.
    INAF, Osservatorio Astrofis & Sci Spazio Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy.
    Costigan, G.
    Leiden Univ, Leiden Observ, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands.
    Cowell, S.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Crifo, F.
    Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    Crosta, M.
    INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
    Crowley, C.
    ESA ESAC, HE Space Operat BV, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Cuypers, J.
    Royal Observ Belgium, Ringlaan 3, B-1180 Brussels, Belgium.
    Dafonte, C.
    Univ A Coruna, CITIC, Dept Comp Sci, Campus Elvina S-N, La Coruna 15071, Spain.
    Damerdji, Y.
    CRAAG, Route Observ Bp 63, Algiers 16340, Algeria;Univ Liege, Inst Astrophys & Geophys, 19c Allee 6 Aout, B-4000 Liege, Belgium.
    Dapergolas, A.
    Natl Observ Athens I Metaxa & Vas Pavlou Palaia P, Athens 15236, Greece.
    David, P.
    Univ Lille, Sorbonne Univ, Univ PSL, Observ Paris,IMCCE, 77 Av Denfert Rochereau, F-75014 Paris, France.
    David, M.
    Univ Antwerp, Onderzoeksgroep Toegepaste Wiskunde, Middelheimlaan 1, B-2020 Antwerp, Belgium.
    de laverny, P.
    Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ,CS 34229, F-06304 Nice 4, France.
    De Luise, F.
    INAF, Osservatorio Astron Abruzzo, Via Mentore Maggini, I-64100 Teramo, Italy.
    De March, R.
    ALTEC SpA, Corso Marche 79, I-10146 Turin, Italy.
    de Martino, D.
    INAF, Osservatorio Astron Capodimonte, Via Moiariello 16, I-80131 Naples, Italy.
    de Souza, R.
    Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Rua Matao 1226,Cidade Univ, BR-05508900 Sao Paulo, Brazil.
    de Torres, A.
    ESA ESAC, HE Space Operat BV, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Debosscher, J.
    Katholieke Univ Leuven, Inst Sterrenkunde, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
    del Pozo, E.
    ESA ESAC, Aurora Technol, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Delbo, M.
    Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ,CS 34229, F-06304 Nice 4, France.
    Delgado, A.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Delgado, H. E.
    UNED, Dept Inteligencia Artificial, C Juan Rosal 16, Madrid 28040, Spain.
    Diakite, S.
    Univ Bourgogne Franche Comte, Inst UTINAM UMR6213, CNRS, OSU THETA Franche Comte Bourgogne, F-25000 Besancon, France.
    Diener, C.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Distefano, E.
    INAF, Osservatorio Astrofis Catania, Via S Sofia 78, I-95123 Catania, Italy.
    Dolding, C.
    Univ Coll London, Mullard Space Sci Lab, Holmbury St Mary, Dorking RH5 6NT, Surrey, England.
    Drazinos, P.
    Univ Athens, Dept Astrophys Astron & Mech, Panepistimiopolis, Athens 15783, Greece.
    Duran, J.
    ESA ESAC, Isdefe, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Edvardsson, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
    Enke, H.
    AIP, Leibniz Inst Astrophys Potsdam, Sternwarte 16, D-14482 Potsdam, Germany.
    Eriksson, Kjell
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Esquej, P.
    ESA ESAC, RHEA, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Bontemps, G. Eynard
    CNES Ctr Spatial Toulouse, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Fabre, C.
    CNES Ctr Spatial Toulouse, ATOS, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Fabrizio, M.
    INAF, Osservatorio Astron Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Italy;ASI, Space Sci Data Ctr, Via Politecn SNC, I-00133 Rome, Italy.
    Faigler, S.
    Tel Aviv Univ, Sch Phys & Astron, IL-6997801 Tel Aviv, Israel.
    Falcao, A. J.
    UNINOVA CTS, Campus FCT UNL, P-2829516 Caparica, Portugal.
    Casas, M. Farras
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Federici, L.
    INAF, Osservatorio Astrofis & Sci Spazio Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy.
    Fedorets, G.
    Univ Helsinki, Dept Phys, FIN-00014 Helsinki, Finland.
    Fernique, P.
    Univ Strasbourg, CNRS, Observ Astron Strasbourg, UMR 7550, 11 Rue Univ, F-67000 Strasbourg, France.
    Figueras, F.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Filippi, F.
    ALTEC SpA, Corso Marche 79, I-10146 Turin, Italy.
    Findeisen, K.
    Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    Fonti, A.
    ALTEC SpA, Corso Marche 79, I-10146 Turin, Italy.
    Fraile, E.
    ESA ESAC, RHEA, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Fraser, M.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England;Univ Coll Dublin, Sch Phys, OBrien Ctr Sci North, Dublin 4, Ireland.
    Frezouls, B.
    Univ Antwerp, Onderzoeksgroep Toegepaste Wiskunde, Middelheimlaan 1, B-2020 Antwerp, Belgium.
    Gai, M.
    INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
    Galleti, S.
    INAF, Osservatorio Astrofis & Sci Spazio Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy.
    Garabato, D.
    Univ A Coruna, CITIC, Dept Comp Sci, Campus Elvina S-N, La Coruna 15071, Spain.
    Garcia-Sedano, F.
    UNED, Dept Inteligencia Artificial, C Juan Rosal 16, Madrid 28040, Spain.
    Garofalo, A.
    Univ Bologna, Dipartimento Fis & Astron, Via Piero Gobetti 93-2, I-40129 Bologna, Italy;INAF, Osservatorio Astrofis & Sci Spazio Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy.
    Garralda, N.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Gavel, Alvin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Gavras, P.
    Univ Athens, Dept Astrophys Astron & Mech, Panepistimiopolis, Athens 15783, Greece;Natl Observ Athens I Metaxa & Vas Pavlou Palaia P, Athens 15236, Greece;Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    Gerssen, J.
    AIP, Leibniz Inst Astrophys Potsdam, Sternwarte 16, D-14482 Potsdam, Germany.
    Geyer, R.
    Tech Univ Dresden, Lohrmann Observ, Mommsenstr 13, D-01062 Dresden, Germany.
    Giacobbe, P.
    INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
    Gilmore, G.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Girona, S.
    Ctr Nacl Super Comp, Barcelona Supercomputing Ctr, C Jordi Girona 29,Ed Nexus 2, Barcelona 08034, Spain.
    Giuffrida, G.
    INAF, Osservatorio Astron Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Italy;ASI, Space Sci Data Ctr, Via Politecn SNC, I-00133 Rome, Italy.
    Glass, F.
    Univ Geneva, Dept Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland.
    Gomes, M.
    Univ Lisbon, CENTRA, FCUL, Campo Grande,Edif C8, P-1749016 Lisbon, Portugal.
    Granvik, M.
    Lulea Univ Technol, Dept Comp Sci Elect & Space Engn, Box 848, S-98128 Kiruna, Sweden;Univ Helsinki, Dept Phys, FIN-00014 Helsinki, Finland.
    Gueguen, A.
    Max Planck Inst Extraterrestrial Phys, High Energy Grp, Giessenbachstr, D-85741 Garching, Germany;Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    Guerrier, A.
    CNES Ctr Spatial Toulouse, Thales Serv, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Guiraud, J.
    CNES Ctr Spatial Toulouse, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Gutierrez-Sanchez, R.
    ESA ESAC, Telespazio Vega UK Ltd, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Haigron, R.
    Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    Hatzidimitriou, D.
    Univ Athens, Dept Astrophys Astron & Mech, Panepistimiopolis, Athens 15783, Greece;Natl Observ Athens I Metaxa & Vas Pavlou Palaia P, Athens 15236, Greece.
    Hauser, M.
    Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany;Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany.
    Haywood, M.
    Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    Heiter, Ulrike
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
    Helmi, A.
    Univ Groningen, Kapteyn Astron Inst, Landleven 12, NL-9747 AD Groningen, Netherlands.
    Heu, J.
    Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    Hilger, T.
    Tech Univ Dresden, Lohrmann Observ, Mommsenstr 13, D-01062 Dresden, Germany.
    Hobbs, D.
    Lund Univ, Dept Astron & Theoret Phys, Lund Observ, Box 43, S-22100 Lund, Sweden.
    Hofmann, W.
    Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany.
    Holland, G.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Huckle, H. E.
    Univ Coll London, Mullard Space Sci Lab, Holmbury St Mary, Dorking RH5 6NT, Surrey, England.
    Hypki, A.
    Adam Mickiewicz Univ, Astron Observ Inst, Fac Phys, Sloneczna 36, PL-60286 Poznan, Poland;Leiden Univ, Leiden Observ, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands.
    Icardi, V.
    ALTEC SpA, Corso Marche 79, I-10146 Turin, Italy.
    Janssen, K.
    AIP, Leibniz Inst Astrophys Potsdam, Sternwarte 16, D-14482 Potsdam, Germany.
    Jevardat de Fombelle, G.
    Univ Geneva, Dept Astron, Chemin Ecogia 16, CH-1290 Versoix, Switzerland.
    Jonker, P. G.
    Radboud Univ Nijmegen, Dept Astrophys, IMAPP, POB 9010, NL-6500 GL Nijmegen, Netherlands;SRON, Netherlands Inst Space Res, Sorbonnelaan 2, NL-3584CA Utrecht, Netherlands.
    Juhasz, A. L.
    Hungarian Acad Sci, Konkoly Observ, Res Ctr Astron & Earth Sci, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary;Eotvos Lorand Univ, Egyet Ter 1-3, H-1053 Budapest, Hungary.
    Julbe, F.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Karampelas, A.
    Amer Community Sch Athens, 129 Aghias Paraskevis Ave & Kazantzaki St, Athens 15234, Greece;Univ Athens, Dept Astrophys Astron & Mech, Panepistimiopolis, Athens 15783, Greece.
    Kewley, A.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Klar, J.
    AIP, Leibniz Inst Astrophys Potsdam, Sternwarte 16, D-14482 Potsdam, Germany.
    Kochoska, A.
    Univ Ljubljana, Fac Math & Phys, Jadranska Ulica 19, Ljubljana 1000, Slovenia;Villanova Univ, Dept Astrophys & Planetary Sci, 800 Lancaster Ave, Villanova, PA 19085 USA.
    Kohley, R.
    ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Kolenberg, K.
    Katholieke Univ Leuven, Inst Sterrenkunde, Celestijnenlaan 200D, B-3001 Leuven, Belgium;Univ Antwerp, Phys Dept, Groenenborgerlaan 171, B-2020 Antwerp, Belgium;Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA.
    Kontizas, M.
    Univ Athens, Dept Astrophys Astron & Mech, Panepistimiopolis, Athens 15783, Greece.
    Kontizas, E.
    Natl Observ Athens I Metaxa & Vas Pavlou Palaia P, Athens 15236, Greece.
    Koposov, S. E.
    Carnegie Mellon Univ, McWilliams Ctr Cosmol, Dept Phys, 5000 Forbes Ave, Pittsburgh, PA 15213 USA;Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Kordopatis, G.
    Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ,CS 34229, F-06304 Nice 4, France.
    Kostrzewa-Rutkowska, Z.
    Radboud Univ Nijmegen, Dept Astrophys, IMAPP, POB 9010, NL-6500 GL Nijmegen, Netherlands;SRON, Netherlands Inst Space Res, Sorbonnelaan 2, NL-3584CA Utrecht, Netherlands.
    Koubsky, P.
    Acad Sci Czech Republ, Astron Inst, Fricova 298, Ondrejov 25165, Czech Republic.
    Lambert, S.
    Sorbonne Univ, LNE, Univ PSL, Observ Paris,SYRTE,CNRS, 61 Ave Observ, F-75014 Paris, France.
    Lanza, A. F.
    INAF, Osservatorio Astrofis Catania, Via S Sofia 78, I-95123 Catania, Italy.
    Lasne, Y.
    CNES Ctr Spatial Toulouse, Thales Serv, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Lavigne, J. -B
    Le Fustec, Y.
    CNES Ctr Spatial Toulouse, Telespazio, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Le Poncin-Lafitte, C.
    Sorbonne Univ, LNE, Univ PSL, Observ Paris,SYRTE,CNRS, 61 Ave Observ, F-75014 Paris, France.
    Lebreton, Y.
    Univ Rennes 1, Inst Phys Rennes, F-35042 Rennes, France;Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    Leccia, S.
    INAF, Osservatorio Astron Capodimonte, Via Moiariello 16, I-80131 Naples, Italy.
    Leclerc, N.
    Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    Lecoeur-Taibi, I.
    Univ Geneva, Dept Astron, Chemin Ecogia 16, CH-1290 Versoix, Switzerland.
    Lenhardt, H.
    Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany.
    Leroux, F.
    CNES Ctr Spatial Toulouse, Thales Serv, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Liao, S.
    Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China;INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy;Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China.
    Licata, E.
    EURIX Srl, Corso Vittorio Emanuele 2 61, I-10128 Turin, Italy.
    Lindstrom, H. E. P.
    Univ Copenhagen, Niels Bohr Inst, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark;DXC Technol, Retortvej 8, DK-2500 Valby, Denmark.
    Lister, T. A.
    Las Cumbres Observ, 6740 Cortona Dr Suite, Goleta, CA 93117 USA.
    Livanou, E.
    Univ Athens, Dept Astrophys Astron & Mech, Panepistimiopolis, Athens 15783, Greece.
    Lobel, A.
    Royal Observ Belgium, Ringlaan 3, B-1180 Brussels, Belgium.
    Lopez, M.
    ESA ESAC, Dept Astrofis, Ctr Astrobiol, CSIC INTA, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Managau, S.
    CNES Ctr Spatial Toulouse, Thales Serv, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Mann, R. G.
    Univ Edinburgh, Royal Observ, Inst Astron, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland.
    Mantelet, G.
    Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany.
    Marchal, O.
    Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    Marchant, J. M.
    Liverpool John Moores Univ, Astrophys Res Inst, 146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England.
    Marconi, M.
    INAF, Osservatorio Astron Capodimonte, Via Moiariello 16, I-80131 Naples, Italy.
    Marinoni, S.
    INAF, Osservatorio Astron Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Italy;ASI, Space Sci Data Ctr, Via Politecn SNC, I-00133 Rome, Italy.
    Marschalko, G.
    Hungarian Acad Sci, Konkoly Observ, Res Ctr Astron & Earth Sci, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary;Univ Szeged, Baja Observ, Szegedi Ut II 70, H-6500 Baja, Hungary.
    Marshall, D. J.
    Univ Paris Diderot, Lab AIM, IRFU Serv Astrophys, CEA DSM CNRS, Bat 709,CEA Saclay, F-91191 Gif Sur Yvette, France.
    Martino, M.
    ALTEC SpA, Corso Marche 79, I-10146 Turin, Italy.
    Marton, G.
    Hungarian Acad Sci, Konkoly Observ, Res Ctr Astron & Earth Sci, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary.
    Mary, N.
    CNES Ctr Spatial Toulouse, Thales Serv, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Massari, D.
    Univ Groningen, Kapteyn Astron Inst, Landleven 12, NL-9747 AD Groningen, Netherlands.
    Matijevic, G.
    AIP, Leibniz Inst Astrophys Potsdam, Sternwarte 16, D-14482 Potsdam, Germany.
    Mazeh, T.
    Tel Aviv Univ, Sch Phys & Astron, IL-6997801 Tel Aviv, Israel.
    McMillan, P. J.
    Lund Univ, Dept Astron & Theoret Phys, Lund Observ, Box 43, S-22100 Lund, Sweden.
    Messina, S.
    INAF, Osservatorio Astrofis Catania, Via S Sofia 78, I-95123 Catania, Italy.
    Michalik, D.
    Lund Univ, Dept Astron & Theoret Phys, Lund Observ, Box 43, S-22100 Lund, Sweden.
    Millar, N. R.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Molina, D.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Molinaro, R.
    INAF, Osservatorio Astron Capodimonte, Via Moiariello 16, I-80131 Naples, Italy.
    Molnar, L.
    Hungarian Acad Sci, Konkoly Observ, Res Ctr Astron & Earth Sci, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary.
    Montegriffo, P.
    INAF, Osservatorio Astrofis & Sci Spazio Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy.
    Mor, R.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Morbidelli, R.
    INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
    Morel, T.
    Univ Liege, Inst Astrophys & Geophys, 19c Allee 6 Aout, B-4000 Liege, Belgium.
    Morris, D.
    Univ Edinburgh, Royal Observ, Inst Astron, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland.
    Mulone, A. F.
    ALTEC SpA, Corso Marche 79, I-10146 Turin, Italy.
    Muraveva, T.
    Musella, I.
    INAF, Osservatorio Astron Capodimonte, Via Moiariello 16, I-80131 Naples, Italy.
    Nelemans, G.
    Radboud Univ Nijmegen, Dept Astrophys, IMAPP, POB 9010, NL-6500 GL Nijmegen, Netherlands;Katholieke Univ Leuven, Inst Sterrenkunde, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
    Nicastro, L.
    INAF, Osservatorio Astrofis & Sci Spazio Bologna, Via Piero Gobetti 93-3, I-40129 Bologna, Italy.
    Noval, L.
    CNES Ctr Spatial Toulouse, Thales Serv, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    O'Mullane, W.
    Large Synopt Survey Telescope, 950 N Cherry Ave, Tucson, AZ 85719 USA;ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Ordenovic, C.
    Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ,CS 34229, F-06304 Nice 4, France.
    Ordonez-Blanco, D.
    Univ Geneva, Dept Astron, Chemin Ecogia 16, CH-1290 Versoix, Switzerland.
    Osborne, P.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Pagani, C.
    Univ Leicester, Dept Phys & Astron, Leicester Inst Space & Earth Observat, Univ Rd, Leicester LE1 7RH, Leics, England.
    Pagano, I.
    INAF, Osservatorio Astrofis Catania, Via S Sofia 78, I-95123 Catania, Italy.
    Pailler, F.
    CNES Ctr Spatial Toulouse, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Palacin, H.
    CNES Ctr Spatial Toulouse, Thales Serv, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Palaversa, L.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England;Univ Geneva, Dept Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland.
    Panahi, A.
    Tel Aviv Univ, Sch Phys & Astron, IL-6997801 Tel Aviv, Israel.
    Pawlak, M.
    Univ Warsaw Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland;Charles Univ Prague, Inst Theoret Phys, Fac Math & Phys, Prague, Czech Republic.
    Piersimoni, A. M.
    INAF, Osservatorio Astron Abruzzo, Via Mentore Maggini, I-64100 Teramo, Italy.
    Pineau, F. -X
    Plachy, E.
    Hungarian Acad Sci, Konkoly Observ, Res Ctr Astron & Earth Sci, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary.
    Plum, G.
    Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    Poggio, E.
    Univ Torino, Dipartimento Fis, Via Pietro Giuria 1, I-10125 Turin, Italy;INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
    Poujoulet, E.
    CNES Ctr Spatial Toulouse, AKKA, 18 Ave Edouard Belin, F-31401 Toulouse 9, France;ESA ESTEC, HE Space Operat BV, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands.
    Prsa, A.
    Villanova Univ, Dept Astrophys & Planetary Sci, 800 Lancaster Ave, Villanova, PA 19085 USA.
    Pulone, L.
    INAF, Osservatorio Astron Roma, Via Frascati 33, I-00078 Monte Porzio Catone, Italy.
    Racero, E.
    ESA ESAC, Serco Gest Negocios, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Ragaini, S.
    Rambaux, N.
    Univ Lille, Sorbonne Univ, Univ PSL, Observ Paris,IMCCE, 77 Av Denfert Rochereau, F-75014 Paris, France.
    Ramos-Lerate, M.
    ESA ESAC, Vitrociset Belgium, Camino Bajo Castillo S-N, Madrid 28692, Spain;Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA.
    Regibo, S.
    Katholieke Univ Leuven, Inst Sterrenkunde, Celestijnenlaan 200D, B-3001 Leuven, Belgium.
    Reyle, C.
    Univ Bourgogne Franche Comte, Inst UTINAM UMR6213, CNRS, OSU THETA Franche Comte Bourgogne, F-25000 Besancon, France.
    Riclet, F.
    CNES Ctr Spatial Toulouse, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Ripepi, V.
    INAF, Osservatorio Astron Capodimonte, Via Moiariello 16, I-80131 Naples, Italy.
    Riva, A.
    INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
    Rivard, A.
    CNES Ctr Spatial Toulouse, Thales Serv, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Rixon, G.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Roegiers, T.
    ESA ESAC, QUASAR Sci Resources, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Roelens, M.
    Univ Geneva, Dept Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland.
    Romero-Gomez, M.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Rowell, N.
    Univ Edinburgh, Royal Observ, Inst Astron, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland.
    Royer, F.
    Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    Ruiz-Dern, L.
    Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    Sadowski, G.
    Univ Libre Bruxelles, Inst Astron & Astrophys, CP 226,Blvd Triomphe, B-1050 Brussels, Belgium.
    Sagrista Selles, T.
    Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany.
    Sahlmann, J.
    Fork Res, Rua Cruzado Osberno,Lt 1,9 Esq, Lisbon, Portugal;ESA ESAC, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Salgado, J.
    CNES Ctr Spatial Toulouse, APAVE SUDEUROPE SAS, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Salguero, E.
    ESA ESAC, ATG Europe, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Sanna, N.
    INAF Osservatorio Astrofis Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy.
    Santana-Ros, T.
    Adam Mickiewicz Univ, Astron Observ Inst, Fac Phys, Sloneczna 36, PL-60286 Poznan, Poland.
    Sarasso, M.
    INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
    Savietto, H.
    Nord Optic Telescope, Rambla Jose Ana Fernandez Perez 7, Brena Baja 38711, Spain.
    Schultheis, M.
    Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ,CS 34229, F-06304 Nice 4, France.
    Sciacca, E.
    INAF, Osservatorio Astrofis Catania, Via S Sofia 78, I-95123 Catania, Italy.
    Segol, M.
    Spanish Virtual Observ, Santander, Spain.
    Segovia, J. C.
    ESA ESAC, Serco Gest Negocios, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Segransan, D.
    Univ Geneva, Dept Astron, Chemin Maillettes 51, CH-1290 Versoix, Switzerland.
    Shih, I-C
    Siltala, L.
    INAF, Fdn Galileo Galilei, Rambla Jose Ana Fernandez Perez 7, Brena Baja 38712, Santa Cruz Tene, Spain;Univ Helsinki, Dept Phys, FIN-00014 Helsinki, Finland.
    Silva, A. F.
    Univ Lisbon, CENTRA, FCUL, Campo Grande,Edif C8, P-1749016 Lisbon, Portugal.
    Smart, R. L.
    INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
    Smith, K. W.
    Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.
    Solano, E.
    ESA ESAC, Dept Astrofis, Ctr Astrobiol, CSIC INTA, Camino Bajo Castillo S-N, Madrid 28692, Spain;ESA ESAC, INSA, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Solitro, F.
    ALTEC SpA, Corso Marche 79, I-10146 Turin, Italy.
    Sordo, R.
    INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy.
    Soria Nieto, S.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Souchay, J.
    Sorbonne Univ, LNE, Univ PSL, Observ Paris,SYRTE,CNRS, 61 Ave Observ, F-75014 Paris, France.
    Spagna, A.
    INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
    Spoto, F.
    Univ Lille, Sorbonne Univ, Univ PSL, Observ Paris,IMCCE, 77 Av Denfert Rochereau, F-75014 Paris, France;Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ,CS 34229, F-06304 Nice 4, France.
    Stampa, U.
    Heidelberg Univ, Zentrum Astron, Astron Rechen Inst, Monchhofstr 12-14, D-69120 Heidelberg, Germany.
    Steele, I. A.
    Liverpool John Moores Univ, Astrophys Res Inst, 146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England.
    Steidelmueller, H.
    Tech Univ Dresden, Lohrmann Observ, Mommsenstr 13, D-01062 Dresden, Germany.
    Stephenson, C. A.
    ESA ESAC, Telespazio Vega UK Ltd, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Stoev, H.
    Univ Complutense Madrid, Dept Arquitectura Computadores & Automat, Fac Informat, C Prof Jose Garcia Santesmases S-N, E-28040 Madrid, Spain.
    Suess, F. F.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Surdej, J.
    Univ Liege, Inst Astrophys & Geophys, 19c Allee 6 Aout, B-4000 Liege, Belgium.
    Szabados, L.
    Hungarian Acad Sci, Konkoly Observ, Res Ctr Astron & Earth Sci, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary.
    Szegedi-Elek, E.
    Hungarian Acad Sci, Konkoly Observ, Res Ctr Astron & Earth Sci, Konkoly Thege Miklos Ut 15-17, H-1121 Budapest, Hungary.
    Tapiador, D.
    Univ Bristol, HH Wills Phys Lab, Tyndall Ave, Bristol BS8, Avon, England;IEEC, Gran Capita 2-4,08034, Bristol BS8 1TL, Avon, England.
    Taris, F.
    Sorbonne Univ, LNE, Univ PSL, Observ Paris,SYRTE,CNRS, 61 Ave Observ, F-75014 Paris, France.
    Tauran, G.
    CNES Ctr Spatial Toulouse, Thales Serv, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Taylor, M. B.
    Univ Vigo, Appl Phys Dept, Vigo 36310, Spain.
    Teixeira, R.
    Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Rua Matao 1226,Cidade Univ, BR-05508900 Sao Paulo, Brazil.
    Terrett, D.
    Rutherford Appleton Lab, STFC, Harwell OX11 0QX, Didcot, England.
    Teyssandier, P.
    Sorbonne Univ, LNE, Univ PSL, Observ Paris,SYRTE,CNRS, 61 Ave Observ, F-75014 Paris, France.
    Thuillot, W.
    Univ Lille, Sorbonne Univ, Univ PSL, Observ Paris,IMCCE, 77 Av Denfert Rochereau, F-75014 Paris, France.
    Titarenko, A.
    Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ,CS 34229, F-06304 Nice 4, France.
    Clotet, F. Torra
    Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, 120 Ny Munkegade,Bldg 1520, DK-8000 Aarhus, Denmark.
    Turon, C.
    Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    Ulla, A.
    Univ Bonn, Argelander Inst Astron, Hugel 71, D-53121 Bonn, Germany.
    Utrilla, E.
    ESA ESAC, Aurora Technol, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    Uzzi, S.
    ALTEC SpA, Corso Marche 79, I-10146 Turin, Italy.
    Vaillant, M.
    CNES Ctr Spatial Toulouse, Thales Serv, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Valentini, G.
    INAF, Osservatorio Astron Abruzzo, Via Mentore Maggini, I-64100 Teramo, Italy.
    Valette, V.
    CNES Ctr Spatial Toulouse, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    van Elteren, A.
    Leiden Univ, Leiden Observ, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands.
    Van Hemelryck, E.
    Royal Observ Belgium, Ringlaan 3, B-1180 Brussels, Belgium.
    Vaschetto, M.
    ALTEC SpA, Corso Marche 79, I-10146 Turin, Italy.
    Vecchiato, A.
    INAF Osservatorio Astrofis Torino, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
    Veljanoski, J.
    Univ Groningen, Kapteyn Astron Inst, Landleven 12, NL-9747 AD Groningen, Netherlands.
    Viala, Y.
    Univ PSL, GEPI, Observ Paris, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France.
    Vicente, D.
    Ctr Nacl Super Comp, Barcelona Supercomputing Ctr, C Jordi Girona 29,Ed Nexus 2, Barcelona 08034, Spain.
    Vogt, S.
    ESA ESAC, QUASAR Sci Resources, Camino Bajo Castillo S-N, Madrid 28692, Spain.
    von Essen, C.
    Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
    Voss, H.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Votruba, V.
    Acad Sci Czech Republ, Astron Inst, Fricova 298, Ondrejov 25165, Czech Republic.
    Voutsinas, S.
    Univ Edinburgh, Royal Observ, Inst Astron, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland.
    Walmsley, G.
    CNES Ctr Spatial Toulouse, 18 Ave Edouard Belin, F-31401 Toulouse 9, France.
    Weiler, M.
    Univ Barcelona, Inst Ciencies Cosmos, IEEC UB, Marti I Franques 1, Barcelona 08028, Spain.
    Wertz, O.
    Sorbonne Univ, UPMC Univ, Paris 6 & CNRS, UMR 7095,Inst Astrophys Paris, 98 Bis Bd Arago, F-75014 Paris, France.
    Wevers, T.
    Radboud Univ Nijmegen, Dept Astrophys, IMAPP, POB 9010, NL-6500 GL Nijmegen, Netherlands;Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Wyrzykowski, L.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England;Univ Warsaw Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland.
    Yoldas, A.
    Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England.
    Zerjal, M.
    Tel Aviv Univ, Dept Geosci, IL-6997801 Tel Aviv, Israel;Univ Ljubljana, Fac Math & Phys, Jadranska Ulica 19, Ljubljana 1000, Slovenia.
    Ziaeepour, H.
    Univ Bourgogne Franche Comte, Inst UTINAM UMR6213, CNRS, OSU THETA Franche Comte Bourgogne, F-25000 Besancon, France.
    Zorec, J.
    Zschocke, S.
    Tech Univ Dresden, Lohrmann Observ, Mommsenstr 13, D-01062 Dresden, Germany.
    Zucker, S.
    Zurbach, C.
    Univ Montpellier, Lab Univ & Particules Montpellier, Pl Eugene Bataillon,CC72, F-34095 Montpellier 05, France.
    Zwitter, T.
    Univ Ljubljana, Fac Math & Phys, Jadranska Ulica 19, Ljubljana 1000, Slovenia.
    Observational Hertzsprung-Russell diagrams2018In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 616, article id A10Article in journal (Refereed)
    Abstract [en]

    Context. Gaia Data Release 2 provides high-precision astrometry and three-band photometry for about 1.3 billion sources over the full sky. The precision, accuracy, and homogeneity of both astrometry and photometry are unprecedented. Aims. We highlight the power of the Gaia DR2 in studying many fine structures of the Hertzsprung-Russell diagram (HRD). Gaia allows us to present many different HRDs, depending in particular on stellar population selections. We do not aim here for completeness in terms of types of stars or stellar evolutionary aspects. Instead, we have chosen several illustrative examples. Methods. We describe some of the selections that can be made in Gaia DR2 to highlight the main structures of the Gaia HRDs. We select both field and cluster (open and globular) stars, compare the observations with previous classifications and with stellar evolutionary tracks, and we present variations of the Gaia HRD with age, metallicity, and kinematics. Late stages of stellar evolution such as hot subdwarfs, post-AGB stars, planetary nebulae, and white dwarfs are also analysed, as well as low-mass brown dwarf objects. Results. The Gaia HRDs are unprecedented in both precision and coverage of the various Milky Way stellar populations and stellar evolutionary phases. Many fine structures of the HRDs are presented. The clear split of the white dwarf sequence into hydrogen and helium white dwarfs is presented for the first time in an HRD. The relation between kinematics and the HRD is nicely illustrated. Two different populations in a classical kinematic selection of the halo are unambiguously identified in the HRD. Membership and mean parameters for a selected list of open clusters are provided. They allow drawing very detailed cluster sequences, highlighting fine structures, and providing extremely precise empirical isochrones that will lead to more insight in stellar physics. Conclusions. Gaia DR2 demonstrates the potential of combining precise astrometry and photometry for large samples for studies in stellar evolution and stellar population and opens an entire new area for HRD-based studies.

  • 9.
    Barklem, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics.
    Electron-impact excitation of neutral oxygen2007In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 462, no 2, p. 781-788Article in journal (Refereed)
    Abstract [en]

    Aims.Our goal was to calculate transition rates from ground and excited states in neutral oxygen atoms due to electron collisions for non-LTE modelling of oxygen in late-type stellar atmospheres, thus enabling the reliable interpretation of oxygen lines in stellar spectra.Methods.A 38-state R-matrix calculation in LS-coupling has been performed. Basis orbitals from the literature are adopted, and a large set of configurations are included to obtain good representations of the target wave functions. Rate coefficients are calculated by averaging over a Maxwellian velocity distribution. Results.Estimates for the cross sections and rate coefficients are presented for transitions between the seven lowest LS states of neutral oxygen. The cross sections for excitation from the ground state compare well with existing experimental and recent theoretical results.

  • 10.
    Barklem, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Excitation and charge transfer in low-energy hydrogen atom collisions with neutral oxygen2018In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 610, article id A57Article in journal (Refereed)
    Abstract [en]

    Excitation and charge transfer in low-energy O+H collisions is studied; it is a problem of importance for modelling stellar spectra and obtaining accurate oxygen abundances in late-type stars including the Sun. The collisions have been studied theoretically using a previously presented method based on an asymptotic two-electron linear combination of atomic orbitals (LCAO) model of ionic-covalent interactions in the neutral atom-hydrogen-atom system, together with the multichannel Landau-Zener model. The method has been extended to include configurations involving excited states of hydrogen using an estimate for the two-electron transition coupling, but this extension was found to not lead to any remarkably high rates. Rate coefficients are calculated for temperatures in the range 1000-20000 K, and charge transfer and (de) excitation processes involving the first excited S-states, 4s.S-5(0) and 4s.S-3(0), are found to have the highest rates.

  • 11.
    Barklem, Paul
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Self-broadening of Balmer Lines Using Asymptotic Potentials: Application to Stellar Spectroscopy2004In: 17th International Conference on Spectral Line Shapes, 2004Conference paper (Other scientific)
  • 12.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Aspelund-Johansson, Jenny
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    The broadening of Fe II lines by neutral hydrogen collisions2005In: Astronomy and Astrophysics, Vol. 435, p. 373-377Article in journal (Refereed)
  • 13.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Belyaev, A. K.
    Asplund, M.
    Inelastic H+Li and H-+Li+ collisions and non-LTE Li I line formation in stellar atmospheres2003In: Astronomy & Astrophysics, Vol. 409, p. L1-L4Article in journal (Refereed)
  • 14.
    Barklem, Paul
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Belyaev, A. K.
    Dickinson, A. S.
    Gadea, F. X.
    Inelastic Na+H collision data for non-LTE applications in stellar atmospheres2010In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 519, p. A20-Article in journal (Refereed)
    Abstract [en]

    Rate coefficients for inelastic Na+H collisions are calculated for all transitions between the ten levels up to and including the ionic state (ion-pair production), namely Na(3s,3p,4s,3d,4p,5s,4d,4f,5p)+H(1s) and Na++H-. The calculations are based on recent full quantum scattering cross-section calculations. The data are needed for non-LTE applications in cool astrophysical environments, especially cool stellar atmospheres, and are presented for a temperature range of 500-8000 K. From consideration of the sensitivity of the cross-sections to input quantum chemical data and the results of different methods for the scattering calculations, a measure of the possible uncertainties in the rate coefficients is estimated.

  • 15.
    Barklem, Paul
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Belyaev, A. K.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Guitou, M.
    Feautrier, N.
    Gadea, F. X.
    Spielfiedel, A.
    On inelastic hydrogen atom collisions in stellar atmospheres2011In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 530, p. A94-Article in journal (Refereed)
    Abstract [en]

    The influence of inelastic hydrogen atom collisions on non-LTE spectral line formation has been, and remains to be, a significant source of uncertainty for stellar abundance analyses, due to the difficulty in obtaining accurate data for low-energy atomic collisions either experimentally or theoretically. For lack of a better alternative, the classical "Drawin formula" is often used. Over recent decades, our understanding of these collisions has improved markedly, predominantly through a number of detailed quantum mechanical calculations. In this paper, the Drawin formula is compared with the quantum mechanical calculations both in terms of the underlying physics and the resulting rate coefficients. It is shown that the Drawin formula does not contain the essential physics behind direct excitation by H atom collisions, the important physical mechanism being quantum mechanical in character. Quantitatively, the Drawin formula compares poorly with the results of the available quantum mechanical calculations, usually significantly overestimating the collision rates by amounts that vary markedly between transitions.

  • 16.
    Barklem, Paul
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Belyaev, A. K.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Spielfiedel, A.
    Guitou, M.
    Feautrier, N.
    Inelastic Mg plus H collision data for non-LTE applications in stellar atmospheres2012In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 541, p. A80-Article in journal (Refereed)
    Abstract [en]

    Rate coefficients for inelastic Mg+H collisions are calculated for all transitions between the lowest seven levels and the ionic state (charge transfer), namely Mg(3s(2) S-1, 3s3p P-3, 3s3p P-1, 3s4s S-3, 3s4s S-1, 3s3d D-1, 3s4p P-3)+H(1s) and Mg+(3s S-2)+H-. The rate coefficients are based on cross-sections from full quantum scattering calculations, which are themselves based on detailed quantum chemical calculations for the MgH molecule. The data are needed for non-LTE applications in cool astrophysical environments, especially cool stellar atmospheres, and are presented for a temperature range of 500-8000 K. From consideration of the sensitivity of the cross-sections to various uncertainties in the calculations, most importantly input quantum chemical data and the numerical accuracy of the scattering calculations, a measure of the possible uncertainties in the rate coefficients is estimated.

  • 17.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy. Theoretical Astrophysics.
    Christlieb, Norbert
    Department of Physics and Astronomy, Observational Astronomy. Theoretical Astrophysics.
    Beers, T.C.
    Hill, V.
    Bessell, M.S.
    Holmberg, J.
    Marsteller, B.
    Rossi, S.
    Zickgraf, F.-J.
    Reimers, D.
    The Hamburg/ESO R-process Enhanced Star survey (HERES).: II. Spectroscopic analysis of the survey sample2005In: Astronomy and Astrophysics, Vol. 439, p. 129-151Article in journal (Refereed)
  • 18.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy. Theoretical Astrophysics.
    Christlieb, Norbert
    Department of Physics and Astronomy, Observational Astronomy. Theoretical Astrophysics.
    Beers, T.C.
    Hill, V
    Holmberg, J
    Marsteller, B
    Rossi, S
    Zickgraf, F.-J
    Bessell, M.S.
    The Hamburg/ESO R-process Enhanced Star survey (HERES).: Abundances2005In: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution, IAU Symposium Proceedings of the international Astronomical Union 228, 2005, p. 439-443Conference paper (Other (popular scientific, debate etc.))
  • 19.
    Barklem, Paul
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    Kochukhov, Oleg
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    Piskunov, Nikolai
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    O'Mara, B. J.
    Stempels, H. C.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    Hydrogen Line Formation in Cool Stars2001In: 11th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun / [ed] Garcia Lopez, Ramon J.; Rebolo, Rafael; Zapaterio Osorio, Mario Rosa, San Francisco: Astronomical Society of the Pacific , 2001, p. 766-Conference paper (Other academic)
  • 20.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    O'Mara, BJ
    Broadening of lines of BeII, SrII and BaII by collisions with hydrogen atoms and the solar abundance of strontium2000In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, ISSN 0035-8711, Vol. 311, no 3, p. 535-540Article in journal (Refereed)
  • 21.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    O'Mara, B.J.
    Broadening of Spectral Lines of Singly Ionised Atoms by Collisions with Neutral Hydrogen Atoms2001In: 11th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, ASP Conference Proceedings, Vol. 223., 2001, p. 772-Conference paper (Other (popular scientific, debate etc.))
  • 22.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    O'Mara, B.J.
    Comments on alternative calculations of the broadening of spectral lines of neutral sodium by H-atom collisions2001In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, Vol. 34, p. 4785-4799Article in journal (Refereed)
  • 23.
    Barklem, Paul
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Osorio, Y.
    Instituto de Astrofísica de Canarias, vía Láctea.; Universidad de La Laguna, Departamento de Astrofísica.; Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg.
    Fursa, D. V.
    Curtin Institute for Computation, Kent Street.; Department of Physics, Astronomy and Medical Radiation Science, Kent Street.
    Bray, I.
    Curtin Institute for Computation, Kent Street.; Department of Physics, Astronomy and Medical Radiation Science, Kent Street.
    Zatsarinny, O.
    Drake University, Department of Physics and Astronomy.
    Bartschat, K.
    Drake University, Department of Physics and Astronomy.
    Jerkstrand, A.
    Max-Planck Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching.
    Inelastic e plus Mg collision data and its impact on modelling stellar and supernova spectra2017In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 606, article id A11Article in journal (Refereed)
    Abstract [en]

    Results of calculations for inelastic e+Mg effective collision strengths for the lowest 25 physical states of Mg I (up to 3s6p P-1), and thus 300 transitions, from the convergent close-coupling (CCC) and the B-spline R-matrix (BSR) methods are presented. At temperatures of interest, similar to 5000 K, the results of the two calculations differ on average by only 4%,with a scatter of 27%. As the methods are independent, this suggests that the calculations provide datasets for e+Mg collisions accurate to this level. Comparison with the commonly used dataset compiled by Mauas et al. (1988, ApJ, 330, 1008), covering 25 transitions among 12 states, suggests the Mauas et al. data are on average similar to 57% too low, and with a very large scatter of a factor of similar to 6.5. In particular the collision strength for the transition corresponding to the Mg I intercombination line at 457 nm is significantly underestimated by Mauas et al., which has consequences for models that employ this dataset. In giant stars the new data leads to a stronger line compared to previous non-LTE calculations, and thus a reduction in the non-LTE abundance correction by similar to 0.1 dex (similar to 25%). A non-LTE calculation in a supernova ejecta model shows this line becomes significantly stronger, by a factor of around two, alleviating the discrepancy where the 457 nm line in typical models with Mg/O ratios close to solar tended to be too weak compared to observations.

  • 24.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Piskunov, Nikolai
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Hydrogen Balmer Lines as Probes of Stellar Atmospheres2003In: IAUS 210, Modelling of stellar atmospheres, 2003, p. E28-Conference paper (Other scientific)
  • 25.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Piskunov, Nikolai
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    O'Mara, BJ
    A list of data for the broadening of metallic lines by neutral hydrogen collisions2000In: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, ISSN 0365-0138, Vol. 142, no 3, p. 467-473Article in journal (Refereed)
  • 26.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Piskunov, Nikolai
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    O'Mara, BJ
    Self broadening of hydrogen lines: initial results2000In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 355, no 1, p. L5-L8Article in journal (Refereed)
  • 27.
    Barklem, Paul
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Piskunov, Nikolai
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    O'Mara, BJ
    Self-broadening in Balmer line wing formation in stellar atmospheres2000In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 363, no 3, p. 1091-1105Article in journal (Refereed)
  • 28.
    Barklem, Paul S.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Accurate abundance analysis of late-type stars: advances in atomic physics2016In: The Astronomy and Astrophysics Review, ISSN 0935-4956, E-ISSN 1432-0754, Vol. 24, article id 9Article, review/survey (Refereed)
    Abstract [en]

    The measurement of stellar properties such as chemical compositions, masses and ages, through stellar spectra, is a fundamental problem in astrophysics. Progress in the understanding, calculation and measurement of atomic properties and processes relevant to the high-accuracy analysis of F-, G-, and K-type stellar spectra is reviewed, with particular emphasis on abundance analysis. This includes fundamental atomic data such as energy levels, wavelengths, and transition probabilities, as well as processes of photoionisation, collisional broadening and inelastic collisions. A recurring theme throughout the review is the interplay between theoretical atomic physics, laboratory measurements, and astrophysical modelling, all of which contribute to our understanding of atoms and atomic processes, as well as to modelling stellar spectra.

  • 29.
    Barklem, Paul S.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Excitation and charge transfer in low-energy hydrogen atom collisions with neutral iron2018In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 612, article id A90Article in journal (Refereed)
    Abstract [en]

    Data for inelastic processes due to hydrogen atom collisions with iron are needed for accurate modelling of the iron spectrum in late-type stars. Excitation and charge transfer in low-energy Fe+H collisions is studied theoretically using a previously presented method based on an asymptotic two-electron linear combination of atomic orbitals model of ionic-covalent interactions in the neutral atom-hydrogen-atom system, together with the multi-channel Landau-Zener model. An extensive calculation including 166 covalent states and 25 ionic states is presented and rate coefficients are calculated for temperatures in the range 1000-20 000 K. The largest rates are found for charge transfer processes to and from two clusters of states around 6.3 and 6.6 eV excitation, corresponding in both cases to active 4d and 5p electrons undergoing transfer. Excitation and de-excitation processes among these two sets of states are also significant.

  • 30.
    Barklem, Paul S.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Excitation and charge transfer in low-energy hydrogen-atom collisions with neutral atoms: Theory, comparisons, and application to Ca2016In: PHYSICAL REVIEW A, ISSN 2469-9926, Vol. 93, no 4, article id 042705Article in journal (Refereed)
    Abstract [en]

    A theoretical method is presented for the estimation of cross sections and rates for excitation and charge-transfer processes in low-energy hydrogen-atom collisions with neutral atoms, based on an asymptotic two-electron model of ionic-covalent interactions in the neutral atom-hydrogen-atom system. The calculation of potentials and nonadiabatic radial couplings using the method is demonstrated. The potentials are used together with the multichannel Landau-Zener model to calculate cross sections and rate coefficients. The main feature of the method is that it employs asymptotically exact atomic wave functions, which can be determined from known atomic parameters. The method is applied to Li + H, Na + H, and Mg + H collisions, and the results compare well with existing detailed full-quantum calculations. The method is applied to the astrophysically important problem of Ca + H collisions, and rate coefficients are calculated for temperatures in the range 1000-20 000 K.

  • 31.
    Barklem, Paul S.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Hydrogen Atom Collision Processes in Cool Stellar Atmospheres: Effects on Spectral Line Strengths and Measured Chemical Abundances in Old Stars2012In: XXI INTERNATIONAL CONFERENCE ON SPECTRAL LINE SHAPES (ICSLS 2012), 2012, p. 012049-Conference paper (Refereed)
    Abstract [en]

    The precise measurement of the chemical composition of stars is a fundamental problem relevant to many areas of astrophysics. State-of-the-art approaches attempt to unite accurate descriptions of microphysics, non-local thermodynamic equilibrium (non-LTE) line formation and 3D hydrodynamical model atmospheres. In this paper I review progress in understanding inelastic collisions of hydrogen atoms with other species and their influence on spectral line formation and derived abundances in stellar atmospheres. These collisions are a major source of uncertainty in non-LTE modelling of spectral lines and abundance determinations, especially for old, metal-poor stars, which are unique tracers of the early evolution of our galaxy. Full quantum scattering calculations of direct excitation processes X(nl) + H <-> X(n'l') + H and charge transfer processes X(nl) + H <-> X+ + H- have been done for Li, Na and Mg [1,2,3] based on detailed quantum chemical data, e.g. [4]. Rate coefficients have been calculated and applied to non-LTE modelling of spectral lines in stellar atmospheres [5,6,7,8,9]. In all cases we find that charge transfer processes from the first excited S-state are very important, and the processes affect measured abundances for Li, Na and Mg in some stars by as much as 60%. Effects vary with stellar parameters (e.g. temperature, luminosity, metal content) and so these processes are important not only for accurate absolute abundances, but also for relative abundances among dissimilar stars.

  • 32.
    Barklem, Paul S.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Hydrogen lines2008In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. T133, p. 014023-Article in journal (Refereed)
    Abstract [en]

    Advances in modern detectors have allowed hydrogen Balmer lines to be used as high-precision diagnostics of effective temperature in F, G and K stars. Their precision as such a diagnostic is now to a large degree dependent on our understanding of their formation in stellar atmospheres. In this paper, I review the current status of Balmer lines as effective temperature diagnostics and in particular discuss two aspects of their line formation: (i) the question of whether the line wings form in Local Thermodynamic Equilibrium (LTE) or not and (ii) the broadening of the line wings by collisions.

  • 33.
    Barklem, Paul S.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Collet, R.
    Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark..
    Partition functions and equilibrium constants for diatomic molecules and atoms of astrophysical interest2016In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 588, article id A96Article in journal (Refereed)
    Abstract [en]

    Partition functions and dissociation equilibrium constants are presented for 291 diatomic molecules for temperatures in the range from near absolute zero to 10 000 K, thus providing data for many diatomic molecules of astrophysical interest at low temperature. The calculations are based on molecular spectroscopic data from the book of Huber & Herzberg (1979, Constants of Diatomic Molecules) with significant improvements from the literature, especially updated data for ground states of many of the most important molecules by Irikura (2007, J. Phys. Chem. Ref. Data, 36, 389). Dissociation energies are collated from compilations of experimental and theoretical values. Partition functions for 284 species of atoms for all elements from H to U are also presented based on data collected at NIST. The calculated data are expected to be useful for modelling a range of low density astrophysical environments, especially star-forming regions, protoplanetary disks, the interstellar medium, and planetary and cool stellar atmospheres. The input data, which will be made available electronically, also provides a possible foundation for future improvement by the community.

  • 34.
    Barklem, Paul S.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Osorio, Yeisson Fabian Martinez
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Modelling the spectrum of Mg in cool stars2014In: XXII International Conference on Spectral Line Shapes (ICSLS 2014), 2014, p. 012001-, article id 012001Conference paper (Refereed)
    Abstract [en]

    The astrophysical importance of Mg, together with its unique range of spectral features in late-type stars, plus its relative simplicity from an atomic physics point of view, makes it a prime target and test bed for detailed ab initio non-local thermodynamic equilibrium (NLTE) modelling in stellar atmospheres. In this paper, we present example first results for calculations of NLTE Mg line based on a new model atom with significant improvements in the collision data for neutral Mg. We perform calculations for excitation of the lower-lying levels due to electron impacts using the R-matrix method. Recent data for excitation and charge transfer due to hydrogen atom impacts involving low-lying levels are now employed. Further, we have made efforts to use physically-motivated methods for calculating radiative and collisional data involving Rydberg states. The results are compared with observed spectra and the impact of the new calculations briefly explored.

  • 35.
    Barklem, Paul S.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Tscherbul, Timur V.
    Univ Nevada, Dept Phys, Reno, NV 89557 USA..
    Inelastic processes in atomic, molecular and chemical physics (in honour of Andrey K. Belyaev)2015In: Chemical Physics, ISSN 0301-0104, E-ISSN 1873-4421, Vol. 462, p. 1-2Article in journal (Other academic)
  • 36.
    Barklem, Paul
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    Stempels, H.C.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    Allende Prieto, C.
    Kochukhov, Oleg
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    Piskunov, Nikolai
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    O'Mara, B.J.
    Detailed analysis of Balmer lines in cool dwarf stars2002In: Astronomy & Astrophysics, ISSN 0004-6361, Vol. 385, p. 951-Article in journal (Refereed)
  • 37.
    Barklem, Paul
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    Stempels, H.C.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    Kochukhov, Oleg
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    Piskunov, Nikolai
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Observational Astronomy.
    O'Mara, J.B.
    Balmer lines and effective temperatures in cool stars2003In: 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, 2003, p. 1103-Conference paper (Other academic)
  • 38. Beers, T. C.
    et al.
    Christlieb, Norbert
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Bessell, M. S.
    Hill, V.
    Barklem, Paul
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Korn, A.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Ryan, S. G.
    Rossi, S.
    Rhee, J.
    HERES: The Search for r-Process-Enhanced, Metal-Poor Stars2003In: Bulletin American Astronomical Society Meeting, 2003Conference paper (Other scientific)
  • 39. Beers, T. C.
    et al.
    Christlieb, Norbert
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Bessell, M. S.
    Hill, V.
    Barklem, Paul
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Ryan, S. G.
    Rossi, S.
    Korn, A.
    Heres: the Search for R-Process Enhanced, Metal-Poor Stars2003In: Elemental Abundances in Old Stars and Damped Lyman-α Systems, 25th meeting of the IAU, Joint Discussion 15, 2003, p. p. 34-Conference paper (Other scientific)
  • 40. Beers, T.C.
    et al.
    Barklem, Paul
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy. Theoretical Astrophysics.
    Christlieb, Norbert
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy. Theoretical Astrophysics.
    Hill, V.
    Efficient Searches for r-Process-Enhanced, Metal-Poor Stars2005In: Nuclear Physics A, Vol. 758, p. 595-598Article in journal (Other scientific)
  • 41. Beers, T.C.
    et al.
    Lucatello, S.
    Marsteller, B.
    Sivarani, T.
    Barklem, Paul
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Christlieb, Norbert
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Rossi, Silvia
    The frequency of Carbon-enhanced stars in HERES and SDSS2006In: Proceedings of the International Symposium on Nuclear Astrophysics: Nuclei in the Cosmos - IX. 25-30 June 2006, CERN, 2006Conference paper (Other (popular scientific, debate etc.))
  • 42.
    Bellot Rubio, L. R.
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Borrero, J. M.
    Barklem, Paul
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    del Toro Iniesta, J. C.
    Accurate Atomic Parameters from the Solar Spectrum2003In: Frontiers of High Resolution Spectroscopy, 25th meeting of the IAU, Joint Discussion 20, 2003, p. p. 16-Conference paper (Other scientific)
  • 43. Belyaev, A
    et al.
    Barklem, Paul
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Ab initio cross sections for low-energy inelastic H+Li collisions2003Conference paper (Other (popular scientific, debate etc.))
  • 44. Belyaev, A. K.
    et al.
    Barklem, Paul
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Cross sections for low-energy inelastic H+Li collisions2003In: Physical Review A, Vol. 68, no 06, p. 2703-Article in journal (Refereed)
  • 45.
    Belyaev, Andrey K.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Barklem, Paul S.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Gadéa, F. X.
    Vlasov, D. V.
    Low-energy inelastic Na + H collisions2012In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 388, no 9, p. 092001-Article in journal (Refereed)
    Abstract [en]

    We report full quantum scattering calculations for near-threshold collision cross sections for excitation of Na by H. The calculations include contributions from transitions between all singlet states up to and including the ionic state (ion-pair production). The dynamics calculations are based on three sets of recent ab initio and pseudo-potential quantum-chemical calculations. Considerable sensitivity to the couplings employed is found.

  • 46.
    Belyaev, Andrey K.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Barklem, Paul S.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
    Guitou, M.
    Spielfiedel, A.
    Feautrier, N.
    Vlasov, D. V.
    Rodionov, D. S.
    Ab initio cross sections for low-energy inelastic Mg+H collisions2012In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 388, no 9, p. 092002-Article in journal (Refereed)
    Abstract [en]

    Full quantum scattering calculations of cross sections for low-energy near-threshold inelastic Mg + H collisions are reported, such processes being of interest for modelling of Mg spectral lines in stellar atmospheres. Nonadiabatic transions associated with radial couplings at avoided ionic crossings in the 2Σ+ molecular states are found to be the main mechanism for excitation and ion-pair production processes.

  • 47.
    Belyaev, Andrey K.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Barklem, Paul
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Spielfiedel, A.
    Guitou, M.
    Feautrier, N.
    Rodionov, D. S.
    Vlasov, D. V.
    Cross sections for low-energy inelastic Mg + H and Mg+ + H- collisions2012In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 85, no 3, p. 032704-Article in journal (Refereed)
    Abstract [en]

    We report full quantum scattering calculations for low-energy near-threshold inelastic cross sections in Mg + H and Mg+ + H- collisions. The calculations include all transitions between the eight lowest adiabatic MgH((2)Sigma(+)) molecular states, with the uppermost of those diabatically extended to the ionic molecular state in the asymptotic region. This allows us to treat the excitation processes between the seven lowest atomic states of magnesium in collisions with hydrogen atoms, as well as the ion-pair production and the mutual neutralization processes. The collision energy range is from threshold up to 10 eV. These results are important for astrophysical modeling of spectra in stellar atmospheres. The processes in question are carefully examined and several process mechanisms are found. Some mechanisms are determined by interactions between ionic and covalent configurations at relatively large internuclear distances, while others are based on short-range nonadiabatic regions due to interactions between covalent configurations.

  • 48.
    Belyaev, Andrey K.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Yakovleva, Svetlana A.
    Barklem, Paul S.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Inelastic silicon-hydrogen collision data for non-LTE applications in stellar atmospheres2014In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 572, p. A103-Article in journal (Refereed)
    Abstract [en]

    Aims. Inelastic processes in low-energy Si + H and Si+ + H- collisions are treated for the states from the ground state up to the ionic state, in order to provide rate coefficients needed for non-LTE modeling of Si in cool stellar atmospheres. Methods. Electronic molecular structure is determined using a recently proposed model approach based on an asymptotic method in combination with available ab initio potentials. Nonadiabatic nuclear dynamics are treated by means of a combination of multichannel formulas and the branching-probability-current method, based on the Landau-Zener model for nonadiabatic transition probabilities. Results. Cross sections and rate coefficients for inelastic processes in Si + H and Si+ + H- collisions for all transitions between 26 low-lying states plus the ionic state are calculated. It is shown that the highest rate coefficient values correspond to the excitation, de-excitation, ion-pair formation, and mutual neutralization processes involving the Si(3p4p D-3), Si(3p3d F-3), Si(3p4p D-1), Si(3p3d P-3), Si(3p4p S-1), and the ionic Si+ + H- states. These processes are likely to be important in non-LTE modeling.

  • 49. Bikmaev, I.F.
    et al.
    Ryabchikova, T.C.
    Bruntt, H.
    Musaev, F.A.
    Mashonkina, L.I.
    Belyakova, E.V.
    Shimansky, V.V.
    Barklem, Paul
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    Galazutdinov, G.
    Abundance analysis of two late A-type stars HD 32115 and HD 375942002In: Astron. Astrophys., Vol. 389, p. 537-546Article in journal (Refereed)
  • 50. Borrero, J. M.
    et al.
    Bellot Rubio, L. R.
    Barklem, Paul
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Department of Physics and Astronomy, Observational Astronomy.
    del Toro Iniesta, J. C.
    Accurate atomic parameters for near-infrared spectral lines2003In: Astronomy & Astrophysics, Vol. 404, p. 749-762Article in journal (Refereed)
123 1 - 50 of 106
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