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  • 1.
    Adibekyan, V.
    et al.
    Univ Porto, Inst Astrofis & Ciencias Espaco, CAUP, Rua Estrelas, P-4150762 Oporto, Portugal..
    Delgado-Mena, E.
    Univ Porto, Inst Astrofis & Ciencias Espaco, CAUP, Rua Estrelas, P-4150762 Oporto, Portugal..
    Feltzing, S.
    Lund Observ, Dept Astron & Theoret Phys, Lund, Sweden..
    Gonzalez Hernandez, J. I.
    Inst Astrofis Canarias, Tenerife, Spain.;Univ La Laguna, Dept Astrofis, Tenerife, Spain..
    Hinkel, N. R.
    Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ USA.;Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA..
    Korn, Andreas J.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics. Uppsala Univ, Dept Phys & Astron, Uppsala, Sweden..
    Asplund, M.
    Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT, Australia..
    Beck, P. G.
    Univ Paris Diderot, Ctr Saclay, Lab AIM, CEA,DRF,CNRS,IRFU,SAp, Gif Sur Yvette, France..
    Deal, M.
    Univ Montpellier, CNRS, LUPM, UMR 5299, Montpellier, France.;CNRS, IRAP, Toulouse, France..
    Gustafsson, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics. NORDITA, Stockholm, Sweden..
    Honda, S.
    Univ Hyogo, Ctr Astron, Nishi Harima Astron Observ, Sayo, Hyogo, Japan..
    Lind, Karin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics. Max Planck Inst Astron, Heidelberg, Germany..
    Nissen, P. E.
    Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Aarhus C, Denmark..
    Spina, L.
    Univ Sao Paulo, Dept Astron IAG, Sao Paulo, Brazil..
    Sun-like stars unlike the Sun: Clues for chemical anomalies of cool stars2017In: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 338, no 4, p. 442-452Article in journal (Refereed)
    Abstract [en]

    We present a summary of the splinter session Sun-like stars unlike the Sun that was held on June 9, 2016, as part of the Cool Stars 19 conference (Uppsala, Sweden), in which the main limitations (in the theory and observations) in the derivation of very precise stellar parameters and chemical abundances of Sun-like stars were discussed. The most important and most debated processes that can produce chemical peculiarities in solar-type stars were outlined and discussed. Finally, in an open discussion between all the participants, we tried to identify new pathways and prospects toward future solutions of the currently open questions.

  • 2. Hackman, T.
    et al.
    Mantere, M. J.
    Jetsu, L.
    Ilyin, I.
    Kajatkari, P.
    Kochukhov, Oleg
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
    Lehtinen, J.
    Lindborg, M.
    Piskunov, Nikolai
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
    Tuominen, I.
    Spot activity of II Peg2011In: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 332, no 9-10, p. 859-865Article in journal (Refereed)
    Abstract [en]

    We have studied the long-term spot activity of the RS CVn star II Peg by means of Doppler imaging based on spectroscopy and time series analysis of photometry. We present 28 Doppler imaging temperature maps spanning the years 1994-2010, of which 14 were calculated for the present study. The longitudinal spot distribution, derived from the surface temperature maps, is compared with epochs of the light curve minima, derived from photometric observations. We detect a longitudinal drift in the major spot structure during 1995-2003. After this there is a clear decrease in the activity level and no clear drift can be seen. We conclude that the variations could be caused by a cyclic behaviour of the underlying magnetic dynamo.

  • 3. Hahn, G.
    et al.
    Lagerkvist, Claes-Ingvar
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    P/2008 T1 (Boattini): Another comet under transition from Saturn to Jupiter2010In: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 331, no 7, p. 692-695Article in journal (Refereed)
    Abstract [en]

    The newly discovered periodic comet P/2008 T1 (Boattini) is found to have experienced a recent capture into its present orbit, following a close approach to Saturn in 1995 to within 0.17 AU. This orbital change transferred the comet into an orbit tangent to that of Jupiter, which lead to an even closer passage within 0.02 AU with that planet in 2003 decoupling it from the influence of Saturn.

  • 4.
    Hansen, C. J.
    et al.
    Heidelberg Univ, Zentrum Astron, D-69117 Heidelberg, Germany.;Univ Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr, DK-2100 Copenhagen, Denmark..
    Ludwig, H. -G
    Seifert, W.
    Heidelberg Univ, Zentrum Astron, D-69117 Heidelberg, Germany..
    Koch, A.
    Heidelberg Univ, Zentrum Astron, D-69117 Heidelberg, Germany..
    Xu, W.
    Opt Syst Engn, D-74937 Spechbach, Germany..
    Caffau, E.
    Univ Paris Diderot, CNRS, Observ Paris, GEPI, F-92190 Meudon, France..
    Christlieb, N.
    Heidelberg Univ, Zentrum Astron, D-69117 Heidelberg, Germany..
    Korn, Andreas J.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
    Lind, Karin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
    Sbordone, L.
    Millennium Inst Astrophys, Santiago, Chile.;Pontificia Univ Catolica Chilem, Santiago, Chile..
    Ruchti, G.
    Lund Observ, Dept Astron & Theoret Phys, SE-22100 Lund, Sweden..
    Feltzing, S.
    Lund Observ, Dept Astron & Theoret Phys, SE-22100 Lund, Sweden..
    de Jong, R. S.
    Leibniz Inst Astrophys Potsdam, D-14482 Potsdam, Germany..
    Barden, S.
    Leibniz Inst Astrophys Potsdam, D-14482 Potsdam, Germany..
    Schnurr, O.
    Leibniz Inst Astrophys Potsdam, D-14482 Potsdam, Germany..
    Stellar science from a blue wavelength range2015In: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 336, no 7, p. 665-676Article in journal (Refereed)
    Abstract [en]

    From stellar spectra, a variety of physical properties of stars can be derived. In particular, the chemical composition of stellar atmospheres can be inferred from absorption line analyses. These provide key information on large scales, such as the formation of our Galaxy, down to the small-scale nucleosynthesis processes that take place in stars and supernovae. By extending the observed wavelength range toward bluer wavelengths, we optimize such studies to also include critical absorption lines in metal-poor stars, and allow for studies of heavy elements (Z = 38) whose formation processes remain poorly constrained. In this context, spectrographs optimized for observing blue wavelength ranges are essential, since many absorption lines at redder wavelengths are too weak to be detected in metal-poor stars. This means that some elements cannot be studied in the visual-redder regions, and important scientific tracers and science cases are lost. The present era of large public surveys will target millions of stars. It is therefore important that the next generation of spectrographs are designed such that they cover a wide wavelength range and can observe a large number of stars simultaneously. Only then, we can gain the full information from stellar spectra, from both metal-poor to metal-rich ones, that will allow us to understand the aforementioned formation scenarios in greater detail. Here we describe the requirements driving the design of the forthcoming survey instrument 4MOST, a multi-object spectrograph commissioned for the ESO VISTA 4 m-telescope. While 4MOST is also intended for studies of active galactic nuclei, baryonic acoustic oscillations, weak lensing, cosmological constants, supernovae and other transients, we focus here on high-density, wide-area survey of stars and the science that can be achieved with high-resolution stellar spectroscopy. Scientific and technical requirements that governed the design are described along with a thorough line blending analysis. For the high-resolution spectrograph, we find that a sampling of >= 2.5 (pixels per resolving element), spectral resolution of 18 000 or higher, and a wavelength range covering 393-436 nm, is the most well-balanced solution for the instrument. A spectrograph with these characteristics will enable accurate abundance analysis (+/- 0.1 dex) in the blue and allow us to confront the outlined scientific questions.

  • 5.
    Karlsson, Ola
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Creation, detection, and evolution of Jupiter Trojan families2011In: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 332, no 6, p. 562-579Article in journal (Refereed)
  • 6.
    Kochukhov, Oleg
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
    Petit, P.
    Univ Toulouse, UPS OMP, IRAP, Toulouse, France.;CNRS, Inst Rech Astrophys & Planetol, Toulouse, France..
    Strassmeier, K. G.
    Leibniz Inst Astrophys Potsdam AIP, Potsdam, Germany..
    Carroll, T. A.
    Leibniz Inst Astrophys Potsdam AIP, Potsdam, Germany..
    Fares, R.
    Osserv Astrofis Catania, INAF, Catania, Italy..
    Folsom, C. P.
    Univ Toulouse, UPS OMP, IRAP, Toulouse, France.;CNRS, Inst Rech Astrophys & Planetol, Toulouse, France..
    Jeffers, S. V.
    Georg August Univ Gottingen, Inst Astrophys, Gottingen, Germany..
    Korhonen, H.
    Univ Copenhagen, Niels Bohr Inst, Copenhagen, Denmark..
    Monnier, J. D.
    Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA..
    Morin, J.
    Univ Montpellier, CNRS, LUPM, Montpellier, France..
    Rosén, Lisa
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
    Roettenbacher, R. M.
    Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA.;Stockholm Univ, Dept Astron, Stockholm, Sweden..
    Shulyak, D.
    Georg August Univ Gottingen, Inst Astrophys, Gottingen, Germany..
    Surface magnetism of cool stars2017In: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 338, no 4, p. 428-441Article in journal (Refereed)
    Abstract [en]

    Magnetic fields are essential ingredients of many physical processes in the interiors and envelopes of cool stars. Yet their direct detection and characterization is notoriously difficult, requiring high-quality observations and advanced analysis techniques. Significant progress has been recently achieved by several types of direct magnetic field studies on the surfaces of cool, active stars. In particular, complementary techniques of field topology mapping with polarization data and total magnetic flux measurements from intensity spectra have been systematically applied to different classes of active stars, leading to interesting and occasionally controversial results. In this paper, we summarize the current status of direct magnetic field studies of cool stars and investigations of surface inhomogeneities caused by the field, based on the material presented at the Cool Stars 19 splinter session.

  • 7. Liljeström, A. J.
    et al.
    Korpi, M. J.
    Käpylä, P. J.
    Brandenburg, A.
    Lyra, Wladimir
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Turbulent stresses as a function of shear rate in a local disk model2009In: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 330, no 1, p. 92-99Article in journal (Refereed)
    Abstract [en]

    WC Present local numerical models of accretion disk turbulence driven by the magnetorotational instability with varying shear rate. The resulting turbulent stresses are compared with predictions of a closure model in which triple correlations are modelled in terms of quadratic correlations. This local model uses live nondimensional parameters to describe the properties of the flow. We attempt to determine these Closure parameters for our simulations and find that the model does produce qualitatively correct behaviour. In addition, we present results concerning the shear rate dependency of the magnetic to kinetic energy ratio. We find both the turbulent stress ratio and the total stress to be strongly dependent on the shear rate.

  • 8.
    Miglio, A.
    et al.
    Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England.;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Aarhus, Denmark..
    Chiappini, C.
    Leibniz Inst Astrophys Potsdam AIP, Potsdam, Germany..
    Mosser, B.
    Univ Paris Diderot, Univ Pierre & Marie Curie, CNRS, PSL Res Univ,LESIA,Observ Paris, Meudon, France..
    Davies, G. R.
    Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England.;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Aarhus, Denmark..
    Freeman, K.
    Australian Natl Univ, Mt Stromlo Observ, Res Sch Astron & Astrophys, Canberra, ACT 0200, Australia..
    Girardi, L.
    INAF, Osservatorio Astronom Padova, Padua, Italy..
    Jofre, P.
    Univ Cambridge, Inst Astron, Cambridge, England.;Univ Diego Portales, Fac Ingn, Nucleo Astronomia, Santiago, Chile..
    Kawata, D.
    Univ Coll London, Mullard Space Sci Lab, Surrey, England..
    Rendle, B. M.
    Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England.;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Aarhus, Denmark..
    Valentini, M.
    Leibniz Inst Astrophys Potsdam AIP, Potsdam, Germany..
    Casagrande, L.
    Australian Natl Univ, Mt Stromlo Observ, Res Sch Astron & Astrophys, Canberra, ACT 0200, Australia..
    Chaplin, W. J.
    Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England.;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Aarhus, Denmark..
    Gilmore, G.
    Univ Cambridge, Inst Astron, Cambridge, England..
    Hawkins, K.
    Univ Cambridge, Inst Astron, Cambridge, England.;Columbia Univ, Dept Astron, New York, NY USA..
    Holl, B.
    Univ Geneva, Dept Astron, Versoix, Switzerland..
    Appourchaux, T.
    Univ Paris 11, UMR 8617, CNRS, Inst Astrophys Spatiale, Orsay, France..
    Belkacem, K.
    Univ Paris Diderot, Univ Pierre & Marie Curie, CNRS, PSL Res Univ,LESIA,Observ Paris, Meudon, France..
    Bossini, D.
    Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England.;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Aarhus, Denmark..
    Brogaard, K.
    Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England.;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Aarhus, Denmark..
    Goupil, M. -J
    Montalban, J.
    Univ Padua, Dipartimento Fis Astron, Padua, Italy..
    Noels, A.
    Univ Liege, Space Sci Technol & Astrophys Res STAR Inst, Liege, Belgium..
    Anders, F.
    Leibniz Inst Astrophys Potsdam AIP, Potsdam, Germany..
    Rodrigues, T.
    INAF, Osservatorio Astronom Padova, Padua, Italy..
    Piotto, G.
    Univ Padua, Dipartimento Fis Astron, Padua, Italy..
    Pollacco, D.
    Univ Warwick, Dept Phys, Coventry, W Midlands, England..
    Rauer, H.
    German Aerosp Ctr DLR, Inst Planetary Res, Berlin, Germany.;TU Berlin, Ctr Astron & Astrophys, Berlin, Germany..
    Allende Prieto, C.
    Inst Astrofis Canarias, San Cristobal la Laguna, Spain.;Univ La Laguna, Dept Astrofis, San Cristobal la Laguna, Spain..
    Avelino, P. P.
    Univ Porto, Inst Astrofis Ciencias Espaco, CAUP, Oporto, Portugal.;Univ Porto, Dept Fisica & Astron, Fac Ciencias, Oporto, Portugal..
    Babusiaux, C.
    PSL Res Univ, CNRS, Observ Paris, GEPI, Meudon, France..
    Barban, C.
    Univ Paris Diderot, Univ Pierre & Marie Curie, CNRS, PSL Res Univ,LESIA,Observ Paris, Meudon, France..
    Barbuy, B.
    Univ Sao Paulo, Inst Astron & Geofis, Dept Astron, Sao Paulo, Brazil..
    Basu, S.
    Yale Univ, Dept Astron, New Haven, CT 06511 USA..
    Baudin, F.
    Univ Paris 11, UMR 8617, CNRS, Inst Astrophys Spatiale, Orsay, France..
    Benomar, O.
    NYU, NYUAD Inst, Ctr Space Sci, Abu Dhabi, U Arab Emirates..
    Bienayme, O.
    Univ Strasbourg, CNRS, UMR 7550, Observ Astron Strasbourg, Strasbourg, France..
    Binney, J.
    Univ Oxford, Rudolf Peierls Ctr Theoret Phys, Oxford, England..
    Bland-Hawthorn, J.
    Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW, Australia..
    Bressan, A.
    Scuola Int Super Studi Avanzati, Trieste, Italy..
    Cacciari, C.
    INAF, Osservatorio Astron Bologna, Bologna, Italy..
    Campante, T. L.
    Georg August Univ Gottingen, Inst Astrophys, Gottingen, Germany..
    Cassisi, S.
    INAF, Astron Observ Teramo, Teramo, Italy..
    Christensen-Dalsgaard, J.
    Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Aarhus, Denmark..
    Combes, F.
    Observ Paris, LERMA, Paris, France.;Sorbonne Univ, PSL Univ, CNRS, Coll France, Paris, France..
    Creevey, O.
    Univer Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ, Nice 4, France..
    Cunha, M. S.
    Univ Porto, Inst Astrofis Ciencias Espaco, CAUP, Oporto, Portugal..
    de Jong, R. S.
    Leibniz Inst Astrophys Potsdam AIP, Potsdam, Germany..
    de laverny, P.
    Univer Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ, Nice 4, France..
    Degl'Innocenti, S.
    Univ Pisa, Dipartimento Fis Enrico Fermi, Pisa, Italy.;INFN, Sez Pisa, Pisa, Italy..
    Deheuvels, S.
    Univ Toulouse, UPS OMP, IRAP, CNRS, Toulouse, France.;IRAP, Toulouse, France..
    Depagne, E.
    Southern African Large Telescope South African As, Cape Town, South Africa..
    De Ridder, J.
    Katholieke Univ Leuven, Inst Sterrekunde, Leuven, Belgium..
    Di Matteo, P.
    PSL Res Univ, CNRS, Observ Paris, GEPI, Meudon, France..
    Di Mauro, M. P.
    INAF IAPS Ist Astrofis Planetol Spaziali, Rome, Italy..
    Dupret, M. -A
    Eggenberger, P.
    Univ Geneva, Dept Astron, Versoix, Switzerland..
    Elsworth, Y.
    Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England.;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Aarhus, Denmark..
    Famaey, B.
    Univ Strasbourg, CNRS, UMR 7550, Observ Astron Strasbourg, Strasbourg, France..
    Feltzing, S.
    Lund Observ, Dept Astron & Theoret Phy, Lund, Sweden..
    Garcia, R. A.
    Univ Paris Diderot, Ctr Saclay, Lab AIM Paris Saclay, CEA,DRF,CNRS,IRFU,SAp, Gif Sur Yvette, France..
    Gerhard, O.
    Max Planck Inst Extraterr Phys, Garching, Germany..
    Gibson, B. K.
    Univ Hull, EA Milne Ctr Astrophys, Kingston Upon Hull, N Humberside, England..
    Gizon, L.
    NYU, NYUAD Inst, Ctr Space Sci, Abu Dhabi, U Arab Emirates.;Georg August Univ Gottingen, Inst Astrophys, Gottingen, Germany.;Max Planck Inst Stromungsforsch, D-37073 Gottingen, Germany..
    Haywood, M.
    PSL Res Univ, CNRS, Observ Paris, GEPI, Meudon, France..
    Handberg, R.
    Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Aarhus, Denmark..
    Heiter, Ulrike
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
    Hekker, S.
    Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Aarhus, Denmark.;Max Planck Inst Stromungsforsch, D-37073 Gottingen, Germany..
    Huber, D.
    Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Aarhus, Denmark.;Univ Hawaii, Inst Astron, Honolulu, HI USA.;Univ Sydney, Sch Phys, Sydney Inst Astron SIfA, Sydney, NSW, Australia.;SETI Inst, Mountain View, CA USA..
    Ibata, R.
    Univ Strasbourg, CNRS, UMR 7550, Observ Astron Strasbourg, Strasbourg, France..
    Katz, D.
    PSL Res Univ, CNRS, Observ Paris, GEPI, Meudon, France..
    Kawaler, S. D.
    Iowa State Univ, Dept Phys & Astron, Ames, IA USA..
    Kjeldsen, H.
    Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Aarhus, Denmark..
    Kurtz, D. W.
    Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston, Lancs, England..
    Lagarde, N.
    Univ Bourgogne Franche Comte, CNRS, Inst UTINAM,UMR6213, OSU THETA Franche Comte Bourgogne,Obv Besancon, Besancon, France..
    Lebreton, Y.
    Univ Paris Diderot, Univ Pierre & Marie Curie, CNRS, PSL Res Univ,LESIA,Observ Paris, Meudon, France.;Univ Rennes 1, CNRS, UMR 6251, Inst Phys Rennes, Rennes, France..
    Lund, M. N.
    Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England.;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Aarhus, Denmark..
    Majewski, S. R.
    Univ Virginia, Dept Astron, Charlottesville, VA USA..
    Marigo, P.
    Univ Padua, Dipartimento Fis Astron, Padua, Italy..
    Martig, M.
    Liverpool John Moores Univ, Astrophy Res Inst, Liverpool, Merseyside, England..
    Mathur, S.
    Space Sci Inst, Boulder, CO USA..
    Minchev, I.
    Leibniz Inst Astrophys Potsdam AIP, Potsdam, Germany..
    Morel, T.
    Univ Liege, Space Sci Technol & Astrophys Res STAR Inst, Liege, Belgium..
    Ortolani, S.
    INAF, Osservatorio Astronom Padova, Padua, Italy.;Univ Padua, Dipartimento Fis Astron, Padua, Italy..
    Pinsonneault, M. H.
    Ohio State Univ, Dept Astron, Columbus, OH 43210 USA..
    Plez, B.
    Univ Montpellier, Lab Univ & Particules Montpellier, CNRS, Montpellier, France..
    Moroni, P. G. Prada
    Univ Pisa, Dipartimento Fis Enrico Fermi, Pisa, Italy.;INFN, Sez Pisa, Pisa, Italy..
    Pricopi, D.
    Romanian Acad, Astron Inst, Bucharest, Romania..
    Recio-Blanco, A.
    Univer Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Bd Observ, Nice 4, France..
    Reyle, C.
    Univ Bourgogne Franche Comte, CNRS, Inst UTINAM,UMR6213, OSU THETA Franche Comte Bourgogne,Obv Besancon, Besancon, France..
    Robin, A.
    Univ Bourgogne Franche Comte, CNRS, Inst UTINAM,UMR6213, OSU THETA Franche Comte Bourgogne,Obv Besancon, Besancon, France..
    Roxburgh, I. W.
    Queen Mary Univ London, Sch Phys & Astron, Astron Unit, London, England..
    Salaris, M.
    Liverpool John Moores Univ, Astrophy Res Inst, Liverpool, Merseyside, England..
    Santiago, B. X.
    Univ Fed Rio Grande do Sul, Inst Fis, Porto Alegre, RS, Brazil..
    Schiavon, R.
    Liverpool John Moores Univ, Astrophy Res Inst, Liverpool, Merseyside, England..
    Serenelli, A.
    Inst Space Sci IEEC CSIC, Cerdanyola Del Valles, Spain..
    Sharma, S.
    Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW, Australia..
    Aguirre, V. Silva
    Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Aarhus, Denmark..
    Soubiran, C.
    Univ Bordeaux, Lab Astrophys Bordeaux, CNRS, Pessac, France..
    Steinmetz, M.
    Leibniz Inst Astrophys Potsdam AIP, Potsdam, Germany..
    Stello, D.
    Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Aarhus, Denmark.;Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW, Australia.;Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia..
    Strassmeier, K. G.
    Leibniz Inst Astrophys Potsdam AIP, Potsdam, Germany..
    Ventura, P.
    INAF, Osservatorio Astronom Roma, Monte Porzio Catone, Italy..
    Ventura, R.
    INAF, Osservatorio Astrofisico Catania, Catania, Italy..
    Walton, N. A.
    Univ Cambridge, Inst Astron, Cambridge, England..
    Worley, C. C.
    Univ Cambridge, Inst Astron, Cambridge, England..
    PLATO as it is: A legacy mission for Galactic archaeology2017In: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 338, no 6, p. 644-661Article in journal (Refereed)
    Abstract [en]

    Deciphering the assembly history of the Milky Way is a formidable task, which becomes possible only if one can produce high-resolution chrono-chemo-kinematical maps of the Galaxy. Data from large-scale astrometric and spectroscopic surveys will soon provide us with a well-defined view of the current chemo-kinematical structure of the Milky Way, but it will only enable a blurred view on the temporal sequence that led to the present-day Galaxy. As demonstrated by the (ongoing) exploitation of data from the pioneering photometric missions CoRoT, Kepler, and K2, asteroseismology provides the way forward: solar-like oscillating giants are excellent evolutionary clocks thanks to the availability of seismic constraints on their mass and to the tight age-initial mass relation they adhere to. In this paper we identify five key outstanding questions relating to the formation and evolution of the Milky Way that will need precise and accurate ages for large samples of stars to be addressed, and we identify the requirements in terms of number of targets and the precision on the stellar properties that are needed to tackle such questions. By quantifying the asteroseismic yields expected from PLATO for red giant stars, we demonstrate that these requirements are within the capabilities of the current instrument design, provided that observations are sufficiently long to identify the evolutionary state and allow robust and precise determination of acoustic-mode frequencies. This will allow us to harvest data of sufficient quality to reach a 10% precision in age. This is a fundamental prerequisite to then reach the more ambitious goal of a similar level of accuracy, which will be possible only if we have at hand a careful appraisal of systematic uncertainties on age deriving from our limited understanding of stellar physics, a goal that conveniently falls within the main aims of PLATO's core science. We therefore strongly endorse PLATO's current design and proposed observational strategy, and conclude that PLATO, as it is, will be a legacy mission for Galactic archaeology.

  • 9. Morin, J.
    et al.
    Jardine, M.
    Reiners, A.
    Shulyak, D.
    Beeck, B.
    Hallinan, G.
    Hebb, L.
    Hussain, G.
    Jeffers, S. V.
    Kochukhov, Oleg
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
    Vidotto, A.
    Walkowicz, L.
    Multiple views of magnetism in cool stars2013In: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 334, no 1-2, p. 48-52Article in journal (Refereed)
    Abstract [en]

    Magnetic fields are regarded as a crucial element for our understanding of stellar physics. They can be studied with a variety of methods which provide complementary - and sometimes contradictory - information about the structure, strength and dynamics of the magnetic field and its role in the evolution of stars. Stellar magnetic fields can be investigated either with direct methods based on the Zeeman effect or through the observation of activity phenomena resulting from the interaction of the field with the stellar atmosphere. In this Cool Stars 17 Splinter Session we discussed the results obtained by the many ongoing studies of stellar activity and direct studies of surface magnetic fields, as well as the state-of-the-art techniques on which they are based. We show the strengths and limitations of the various approaches currently used and point out their evolution as well as the interest of coupling various magnetism and activity proxies. (C) 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

  • 10.
    Pierre, M.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy. CEA, Serv Astrophys, Saclay, France..
    Adami, C.
    Lab Astrophys, Marseille, France..
    Birkinshaw, M.
    Univ Bristol, Bristol, Avon, England..
    Chiappetti, L.
    INAF IASF, Milan, Italy..
    Ettori, S.
    INAF OABO, Bologna, Italy..
    Evrard, A.
    Univ Michigan, Ann Arbor, MI 48109 USA..
    Faccioli, L.
    CEA, Serv Astrophys, Saclay, France..
    Gastaldello, F.
    INAF IASF, Milan, Italy..
    Giles, P.
    Univ Bristol, Bristol, Avon, England..
    Horellou, C.
    Chalmers, Onsala, Sweden..
    Iovino, A.
    INAF OAB, Brera, Italy..
    Koulouridis, E.
    CEA, Serv Astrophys, Saclay, France..
    Lidman, C.
    Australian Astron Observ, Epping, NSW, Australia..
    Le Brun, A.
    CEA, Serv Astrophys, Saclay, France..
    Maughan, B.
    Univ Bristol, Bristol, Avon, England..
    Maurogordato, S.
    Observ Cote Azur, Nice, France..
    McCarthy, I.
    Univ Liverpool, Liverpool, Merseyside, England..
    Miyazaki, S.
    NAOJ, Tokyo, Japan..
    Pacaud, F.
    Argelander Inst Astron, Bonn, Germany..
    Paltani, S.
    Geneva Observ, ISDC, Versoix, Switzerland..
    Plionis, M.
    Aristotle Univ Thessaloniki, Thessaloniki, Greece..
    Reiprich, T.
    Argelander Inst Astron, Bonn, Germany..
    Sadibekova, T.
    CEA, Serv Astrophys, Saclay, France.;Ulugh Beg Astron Inst, Tashkent, Uzbekistan..
    Smolcic, V.
    Univ Zagreb, Zagreb, Croatia..
    Snowden, S.
    NASA, GSFC, Greenbelt, MD USA..
    Surdej, J.
    Univ Liege, Liege, Belgium..
    Tsirou, M.
    CEA, Serv Astrophys, Saclay, France..
    Vignali, C.
    Univ Bologna, Bologna, Italy..
    Willis, J.
    Univ Victoria, Victoria, BC, Canada..
    Alis, S.
    Istanbul Univ, Istanbul, Turkey..
    Altieri, B.
    European Space Astron Ctr, Madrid, Spain..
    Baran, N.
    Univ Zagreb, Zagreb, Croatia..
    Benoist, C.
    Observ Cote Azur, Nice, France..
    Bongiorno, A.
    INAF OAR, Rome, Italy..
    Bremer, M.
    Univ Bristol, Bristol, Avon, England..
    Butler, A.
    Univ Western Australia, Nedlands, WA, Australia..
    Cappi, A.
    INAF OABO, Bologna, Italy..
    Caretta, C.
    Lab Astrophys, Marseille, France..
    Ciliegi, P.
    INAF OABO, Bologna, Italy..
    Clerc, N.
    MPI Extraterr Phys, Garching, Germany..
    Corasaniti, P. S.
    Observ Paris, Paris, France..
    Coupon, J.
    Geneva Observ, ISDC, Versoix, Switzerland..
    Delhaize, J.
    Univ Zagreb, Zagreb, Croatia..
    Delvecchio, I.
    Univ Zagreb, Zagreb, Croatia..
    Democles, J.
    HSCtr Astrophys, Cambridge, MA USA..
    Desai, Sh
    IIT Hyderabad, Hyderabad, Andhra Pradesh, India..
    Devriendt, J.
    Univ Oxford, Oxford, England..
    Dubois, Y.
    Univ Oxford, Oxford, England..
    Eckert, D.
    Geneva Observ, ISDC, Versoix, Switzerland..
    Elyiv, A.
    Univ Liege, Liege, Belgium..
    Farahi, A.
    Ferraril, C.
    Observ Cote Azur, Nice, France..
    Fotopoulou, S.
    Geneva Observ, ISDC, Versoix, Switzerland..
    Forman, W.
    HSCtr Astrophys, Cambridge, MA USA..
    Georgantopoulos, I.
    Observ Athens, Athens, Greece..
    Guglielmo, V.
    INAF OAP, Padua, Italy..
    Huynh, M.
    Univ Western Australia, Nedlands, WA, Australia..
    Jerlin, N.
    Univ Zagreb, Zagreb, Croatia..
    Jones, Ch.
    HSCtr Astrophys, Cambridge, MA USA..
    Lavoie, S.
    Univ Victoria, Victoria, BC, Canada..
    Le Fevre, J. -P
    Lieu, M.
    European Space Astron Ctr, Madrid, Spain..
    Kilbinger, M.
    CEA, Serv Astrophys, Saclay, France..
    MaruIli, F.
    Univ Bologna, Bologna, Italy..
    Mantz, A.
    Univ Chicago, Chicago, IL 60637 USA..
    McGee, S.
    Univ Birmingham, Birmingham, W Midlands, England..
    Melin, J. -B
    Melnyk, O.
    Univ Zagreb, Zagreb, Croatia..
    Moscardini, L.
    Univ Bologna, Bologna, Italy..
    Novak, M.
    Univ Zagreb, Zagreb, Croatia..
    Piconcelli, E.
    INAF OAR, Rome, Italy..
    Poggianti, B.
    INAF OAP, Padua, Italy..
    Pomarede, D.
    CEA, Serv Informat, Saclay, France..
    Pompei, E.
    European Southern Observ, Garching, Germany..
    Ponman, T.
    Univ Birmingham, Birmingham, W Midlands, England..
    Ceja, M. E. Ramos
    Argelander Inst Astron, Bonn, Germany..
    Rana, P.
    Lund Univ, Lund, Sweden..
    Rapetti, D.
    Univ Colorado, Boulder, CO 80309 USA..
    Raychaudhury, S.
    Univ Birmingham, Birmingham, W Midlands, England..
    Ricci, M.
    Observ Cote Azur, Nice, France..
    Rottgering, H.
    Leiden Univ, Leiden, Netherlands..
    Sahlén, Martin
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Sauvageot, J. -L
    Schimd, C.
    Lab Astrophys, Marseille, France..
    Sereno, M.
    INAF OABO, Bologna, Italy..
    Smith, G. P.
    Univ Birmingham, Birmingham, W Midlands, England..
    Umetsu, K.
    ASIAA, Taipei, Taiwan..
    Valageas, P.
    CEA, Inst Phys Theor, Saclay, France..
    Valotti, A.
    CEA, Serv Astrophys, Saclay, France..
    Valtchanov, I.
    European Space Astron Ctr, Madrid, Spain..
    Veropalumbo, A.
    INAF OABO, Bologna, Italy..
    Ascaso, B.
    Univ Paris Diderot, Paris, France..
    Barnes, D.
    Jodrell Bank, Manchester, Lancs, England..
    De Petris, M.
    Univ Roma La Sapienza, Rome, Italy..
    Durret, F.
    Inst Astrophys Paris, Paris, France..
    Donahue, M.
    Univ Michigan, Ann Arbor, MI 48109 USA..
    Ithana, M.
    Yamagata Univ, Yamagata, Japan..
    Jarvis, M.
    Univ Oxford, Oxford, England..
    Johnston-Hollitt, M.
    Victoria Univ, Wellington, New Zealand..
    Kalfountzou, E.
    European Space Astron Ctr, Madrid, Spain..
    Kay, S.
    Jodrell Bank, Manchester, Lancs, England..
    La Franca, F.
    Univ Roma Tre, Rome, Italy..
    Okabe, N.
    Hiroshima Univ, Hiroshima, Japan..
    Muzzin, A.
    York Univ, Toronto, ON, Canada..
    Rettura, A.
    IPAC, Pasadena, CA USA..
    Ricci, F.
    Univ Roma Tre, Rome, Italy..
    Ridl, J.
    MPI Extraterr Phys, Garching, Germany..
    Risaliti, G.
    Arcetri Observ, Florence, Italy..
    Takizawa, M.
    Yamagata Univ, Yamagata, Japan..
    Thomas, P.
    Univ Sussex, Brighton, E Sussex, England..
    Truong, N.
    Univ Tor Vegata, Rome, Italy..
    The XXL survey: First results and future2017In: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 338, no 2-3, p. 334-341Article in journal (Refereed)
    Abstract [en]

    The XXL survey currently covers two 25 deg(2) patches with XMM observations of similar to 10 ks. We summarize the scientific results associated with the first release of the XXL dataset, which occurred in mid-2016. We review several arguments for increasing the survey depth to 40 ks during the next decade of XMM operations. X-ray (z < 2) cluster, (z < 4) active galactic nuclei (AGN), and cosmic background survey science will then benefit from an extraordinary data reservoir. This, combined with deep multi-lambda observations, will lead to solid standalone cosmological constraints and provide a wealth of information on the formation and evolution of AGN, clusters, and the X-ray background. In particular, it will offer a unique opportunity to pinpoint the z > 1 cluster density. It will eventually constitute a reference study and an ideal calibration field for the upcoming eROSITA and Euclid missions.

  • 11. Telting, J. H.
    et al.
    Avila, G.
    Buchhave, L.
    Frandsen, S.
    Gandolfi, D.
    Lindberg, B.
    Stempels, Eric H. C.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Observational Astronomy.
    Prins, S.
    FIES: The high-resolution Fiber-fed Echelle Spectrograph at the Nordic Optical Telescope2014In: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 335, no 1, p. 41-45Article in journal (Refereed)
    Abstract [en]

    FIES is a cross-dispersed high-resolution echelle spectrograph at the 2.56 m Nordic Optical Telescope (NOT), and was optimised for throughput and stability in 2006. The major 2006 upgrade involved the relocation of FIES to a stable environment and development of a fiber bundle that offers 3 different resolution modes, and made FIES an attractive tool for the user community of the NOT. Radial-velocity stability is achieved through double-chamber active temperature control. A dedicated data reduction tool, FIEStool, was developed. As a result of these upgrades, FIES is now one of the work-horse instruments at the NOT. ((c) 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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