uu.seUppsala University Publications
Change search
Refine search result
1234 1 - 50 of 177
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 1.
    Alvarez, R
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Plez, Bertrand
    Near-infrared narrow-band photometry of M-giant and Mira stars: models meet observations1998In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 330, no 3, p. 1109-1119Article in journal (Refereed)
    Abstract [en]

    From near-infrared, narrow-band photometry of 256 oxygen-rich Mira variables we obtain evidence about the loops that these stars follow in colour-colour diagrams. We also find a phase lag between indices related to molecular band-strength of titanium oxid

  • 2.
    Ardeberg, Arne
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Gustafsson, Bengt
    Linde, Peter
    Nissen, PaulErik
    On the history of star formation in the bar of the Large Magellanic Cloud1997In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 322, no 2, p. L13-L16Article in journal (Refereed)
    Abstract [en]

    With the HST PC and uvby photometry, we investigate evolutionary signatures in a field in the centre of the LMC Bar. Field stars close to the turn off point in the HR diagram are used for a study of ages and evolution of the stellar popu lations dominatin

  • 3.
    Asplund, Martin
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Faculty of Science and Technology, Astronomical observatory. Department of Physics and Astronomy, Theoretical Astrophysics.
    Collet, Remo
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Faculty of Science and Technology, Astronomical observatory. Department of Physics and Astronomy, Theoretical Astrophysics.
    Radiative Transfer in 3D Model Stellar Atmospheres2003In: ASP Conference Proceedings: 3D Stellar Evolution, 2003, p. 197-Conference paper (Other (popular scientific, debate etc.))
    Abstract [en]

    Recently 3D hydrodynamical simulations of stellar surface convection have become feasible thanks to advances in computer technology and efficient numerical algorithms. Available observational diagnostics indicate that these models are highly realistic in describing the topology of stellar granulation and for spectral line formation purposes. The traditional free parameters (mixing length parameters, micro- and macroturbulence) always inherent in standard 1D analyses have thus finally become obsolete. These 3D models can therefore both shed light on the elusive nature of stellar convection as well as be employed in element abundance analyses. In the present contribution we will describe some aspects of the models and possible applications of them in terms of radiative transfer.

  • 4.
    Asplund, Martin
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Gustafsson, Bengt
    Kiselman, D
    Eriksson, Kjell
    Line-blanketed model atmospheres for R Coronae Borealis stars and hydrogen-deficient carbon stars1997In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 318, no 2, p. 521-534Article in journal (Refereed)
    Abstract [en]

    We have constructed line-blanketed model atmospheres for the hydrogen-deficient and carbon-rich R Coronae Borealis (RCrB) stars, as well as for the similar hydrogen-deficient carbon (HdC) stars and the cool extreme helium (EHe) stars. Improved continuum o

  • 5.
    Asplund, Martin
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Gustafsson, Bengt
    Kiselman, D
    Eriksson, Kjell
    Line-blanketed model atmospheres for R Coronae Borealis stars and hydrogen-deficient carbon stars (vol 318, pg 521, 1997)1997In: ASTRONOMY AND ASTROPHYSICS, Vol. 323, no 1, p. 286-286Other (Other scientific)
  • 6.
    Asplund, Martin
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Gustafsson, Bengt
    Lambert, DL
    Rao, NK
    A stellar endgame - The born-again Sakurai's object1997In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 321, no 2, p. L17-L20Article in journal (Refereed)
    Abstract [en]

    The surface chemical composition of this remarkable star shows that it is hydrogen-deficient, carbon-rich and enriched in the light s-process elements. Spectra taken in May and October 1996 indicate a decrease in the surface hydrogen abundance by 0.7 dex

  • 7.
    Asplund, Martin
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Gustafsson, Bengt
    Rao, NK
    Lambert, David L
    Abundance similarities between the R CrB star V854 Cen and the born-again Sakurai's object1998In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 332, no 2, p. 651-660Article in journal (Refereed)
    Abstract [en]

    The elemental abundances of the mildly hydrogen-deficient R Coronae Borealis (R CrB) star V854 Cen have been estimated. The R CrB stars have been divided into majority and minority classes judging by their abundance patterns. Class assignment has previous

  • 8.
    Asplund, Martin
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Ryde, Nils
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory. Physics, Department of Astronomy and Space Physics.
    A non-LTE investigation of carbon in R Coronae Borealis stars1996In: Hydrogen deficient stars, 1996, p. 57-Conference paper (Refereed)
  • 9.
    Baraffe, I
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Allard, F
    Gustafsson, Bengt
    Maeder, A
    Atmosphere models for very low mass stars, brown dwarfs and exoplanets1997In: FUNDAMENTAL STELLAR PROPERTIES: THE INTERACTION BETWEEN OBSERVATION AND THEORY, ISSN 0074-1809, no 189, p. 227-233Article in journal (Other scientific)
  • 10.
    Belskaya, IN
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Lagerkvist, CI
    Physical properties of M class asteroids1996In: PLANETARY AND SPACE SCIENCE, ISSN 0032-0633, Vol. 44, no 8, p. 783-794Article in journal (Refereed)
    Abstract [en]

    The available data on M class asteroids have been collected and analysed. The possible number of M-asteroids in the main asteroid belt larger than 30 km was estimated to be about 90 objects. A list of the 60 asteroids currently classified as M is presente

  • 11.
    Bergvall, N.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Galaxy Evolution - the local sample1999In: Astrophysics with the NOTArticle, book review (Other scientific)
  • 12.
    BERGVALL, N
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    JOHANSSON, L
    A STUDY OF A COMPLETE SAMPLE OF INTERACTING GALAXIES .2. IMAGES, COLOR DISTRIBUTIONS AND SPECTRA1995In: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, ISSN 0365-0138, Vol. 113, no 3, p. 499-537Article in journal (Refereed)
    Abstract [en]

    We present broadband images, two-colour maps and spectra of a magnitude limited sample of interacting and merging galaxies.

  • 13.
    Bergvall, N
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Laurikainen, E
    Aalto, S
    Johansson, L
    Star formation in a magnitude limited sample of interacting galaxies1996In: NEW LIGHT ON GALAXY EVOLUTION, ISSN 0074-1809, no 171, p. 344-344Article in journal (Refereed)
  • 14.
    Bergvall, N., Masegosa, J., Östlin, G., Pharasyn, A.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    The relationship between low surface brightness galaxies and blue compact dwarfs1998In: Highlights of Astronomy, Kluwer , 1998, Vol. 1Conference paper (Other scientific)
  • 15.
    BERGVALL, N
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    RONNBACK, J
    ESO-146-G14, A RETARDED DISC GALAXY1995In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, ISSN 0035-8711, Vol. 273, no 3, p. 603-614Article in journal (Refereed)
    Abstract [en]

    In our search for nearby young and unevolved galaxies we encountered ESO 146 - G14, a blue low-surface-brightness late-type disc galaxy with remarkable properties. The analysis of the chemical abundances of the brightest Hn regions yields an oxygen abunda

  • 16.
    Bergvall, N
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Ronnback, J
    Masegosa, J
    Ostlin, G
    Optical/near-IR surface photometry of blue low surface brightness galaxies1999In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 341, no 3, p. 697-708Article in journal (Refereed)
    Abstract [en]

    We present luminosity profiles, colour profiles and disk parameters based on near-infrared JHK surface photometry of a sample of blue low surface brightness galaxies (BLSBGs). The results are discussed along with previously obtained optical data. We find

  • 17.
    Bergvall, N., Östlin, G.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    The halo population of 4 luminous blue compact galaxies1999In: Galaxy evolution - connecting the distant universe with the local fossil record', Xth recontre de Blois 1998, 1999Conference paper (Other scientific)
  • 18.
    Bergvall, Nils
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Ostlin, Goran
    Karlsson, K-G
    Örndahl, Eva
    Ronnback, Jari
    Emission line flux limits in four QSO metal line absorbers1997In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 321, no 3, p. 771-775Article in journal (Refereed)
    Abstract [en]

    In an effort to detect the early phases of star formation in massive galaxies, we have searched for Ly alpha and [O II]lambda 3727 emission from four QSO metal absorption line systems and possible associated galaxies, using narrow-band filters. None of th

  • 19.
    Bessell, MS
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Castelli, F
    Plez, Bertrand
    Model atmospheres broad-band colors, bolometric corrections and temperature calibrations for O-M stars1998In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 333, no 1, p. 231-250Article in journal (Refereed)
    Abstract [en]

    Broad band colors and bolometric corrections in the Johnson-Cousins-Glass system (Bessell, 1990; Bessell & Brett, 1988) have been computed from synthetic spectra from new model atmospheres of Kurucz (1995a), Castelli (1997), Plez, Brett & Nordlund (1992),

  • 20.
    Bessell, MS
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Castelli, F
    Plez, Bertrand
    Model atmospheres broad-band colors, bolometric corrections and temperature calibrations for O-M stars (vol 333, pg 231, 1998)1998In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 337, no 1, p. 321-321Article in journal (Refereed)
  • 21.
    Carpenter, KG
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Robinson, RD
    Johnson, HR
    Eriksson, Kjell
    Gustafsson, Bengt
    Pijpers, Frank P
    Querci, F
    Querci, M
    Hubble Space Telescope spectroscopy of the carbon star TX Piscium1997In: ASTROPHYSICAL JOURNAL, ISSN 0004-637X, Vol. 486, no 1, p. 457-470Article in journal (Refereed)
    Abstract [en]

    Ultraviolet spectra obtained with the Hubble Space Telescope of the carbon star TX Piscium (HR 9004) are presented, along with analysis providing information on its outer atmosphere, including flow and turbulent velocities, line formation mechanisms, and

  • 22.
    Carsenty, U.
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Nathues, A.
    Lagerkvist, C.-I.
    Mottola, S.
    Hahn, G.
    Braatz, E.
    Comet P/1997 T31997In: 1997IAUC.6754....3COther (Other scientific)
  • 23.
    Collet, Remo
    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, Astronomical observatory. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Theoretical Astrophysics.
    Asplund, Martin
    Trampedach, Regner
    3D Hydrodynamical model stellar atmospheres of metal-poor red giants2005In: Proceedings of the International Astronomical Union, vol. 1: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution, 2005, p. 247-248Conference paper (Other academic)
    Abstract [en]

    We investigate the main differences between static 1D and 3D time-dependent model stellar atmospheres of red giants at very low metallicities. We focus in particular on the impact of 3D LTE spectral line formation on the derivation of elemental abundances for the extremely metal-poor ([Fe/H] ≈-5.3) red giant HE 0107-5240.

  • 24.
    Collet, Remo
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Faculty of Science and Technology, Astronomical observatory. Department of Physics and Astronomy, Theoretical Astrophysics.
    Asplund, Martin
    Trampedach, Regner
    The Chemical Compositions of the Extreme Halo Stars HE 0107-5240 and HE 1327-2326 Inferred from Three-dimensional Hydrodynamical Model Atmospheres2006In: Astrophysical Journal, ISSN 0004-637X, Vol. 664, no 2, p. L121-L124Article in journal (Other (popular scientific, debate etc.))
    Abstract [en]

    We investigate the impact of realistic three-dimensional (3D) hydrodynamical model stellar atmospheres on the determination of elemental abundances in the carbon-rich, hyper-iron-poor stars HE 0107-5240 and HE 1327-2326. We derive the chemical compositions of the two stars by means of a detailed 3D analysis of spectral lines under the assumption of local thermodynamic equilibrium (LTE). The lower temperatures of the line-forming regions of the hydrodynamical models cause changes in the predicted spectral line strengths. In particular, we find the 3D abundances of C, N, and O to be lower by about -0.8 dex (or more) than estimated from a 1D analysis. The 3D abundances of iron peak elements are also decreased but by smaller factors (about -0.2 dex). We caution, however, that the neglected non-LTE effects might actually be substantial for these metals. We finally discuss possible implications for studies of early Galactic chemical evolution.

  • 25.
    Collet, Remo
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Faculty of Science and Technology, Astronomical observatory. Department of Physics and Astronomy, Theoretical Astrophysics.
    Garcia Perez, Ana E.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Faculty of Science and Technology, Astronomical observatory. Department of Physics and Astronomy, Theoretical Astrophysics.
    Asplund, M.
    Thevenin, F.
    Effects of UV Line Blanketing on the Non-LTE Fe I Line Formation2003In: International Astronomical Union Symposium: Modelling of Stellar Atmospheres, 2003, p. B3-Conference paper (Other (popular scientific, debate etc.))
  • 26.
    Dahlgren, M
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    A study of Hilda asteroids - III. Collision velocities and collision frequencies of Hilda asteroids1998In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 336, no 3, p. 1056-1064Article in journal (Refereed)
    Abstract [en]

    The collision velocities and collision frequencies of Hilda asteroids have been investigated numerically. The collision probabilities and collision velocities have been determined from a data base of close encounters, obtained by numerical integrations of

  • 27.
    DAHLGREN, M
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    LAGERKVIST, CI
    A STUDY OF HILDA ASTEROIDS .1. CCD SPECTROSCOPY OF HILDA ASTEROIDS1995In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 302, no 3, p. 907-914Article in journal (Refereed)
    Abstract [en]

    Reflectance spectra with a wavelength coverage between 4000-9100 Angstrom have been obtained for eight Hilda asteroids with the 2.2m telescope at the European Southern Observatory in Chile. From the obtained spectra we determined the Tholen taxonomy for f

  • 28.
    Dahlgren, M
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Lagerkvist, CI
    Fitzsimmons, A
    Williams, IP
    Gordon, M
    A study of Hilda asteroids .2. Compositional implications from optical spectroscopy1997In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 323, no 2, p. 606-619Article in journal (Refereed)
    Abstract [en]

    We obtained 49 reflectance spectra of 23 Hilda asteroids in the wavelength ranges 3850-7650 and 3850-10150 Angstrom during two observing runs in 1992. The primitive D-types dominate and comprise 34% of the numbered Hilda asteroids, while 28% and 2% are P

  • 29.
    Dahlgren, M
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Lahulla, JF
    Lagerkvist, CI
    A study of Hilda asteroids - VI. Analysis of the lightcurve properties1999In: ICARUS, ISSN 0019-1035, Vol. 138, no 2, p. 259-267Article in journal (Refereed)
    Abstract [en]

    The lightcurves of 47 Hilda asteroids presented in Dahlgren et al, (1998, Icarus 133, 247-285) have been analyzed. The Hilda population has mean lightcurve amplitudes significantly larger than those of main-belt asteroids of similar sizes, This is due to

  • 30.
    Dahlgren, M
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Lahulla, JF
    Lagerkvist, CI
    Lagerros, J
    Mottola, S
    Erikson, A
    Gonano-Beurer, M
    Di, Martino M
    A study of Hilda asteroids - V. Lightcurves of 47 Hilda asteroids1998In: ICARUS, ISSN 0019-1035, Vol. 133, no 2, p. 247-285Article in journal (Refereed)
    Abstract [en]

    The results of a photometric survey of Hilda asteroids are presented. We have obtained 224 lightcurves of 47 Hilda asteroids. A wide span of rotation periods have been found, ranging from 2.851 to 31 h. However, indications of rotation periods longer than

  • 31.
    Davidsson, Björn J. R.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Tidal splitting and rotational breakup of solid spheres1999In: Icarus, Vol. 142, no 2, p. 525-535Article in journal (Refereed)
  • 32.
    de, Laverny P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Gustafsson, Bengt
    On the determination of carbon isotopic ratios in cool carbon stars1998In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 332, no 2, p. 661-671Article in journal (Refereed)
    Abstract [en]

    We discuss the determination of carbon isotopic ratios C-12/C-13 in N-type Galactic carbon stars. Ohnaka & Tsuji (1996) reported C-12/C-13 ratios Smaller by a factor 2 or 3 than the determinations of Lambert et al. (1986). Using synthetic spectra of carbo

  • 33.
    de, Laverny P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Gustafsson, Bengt
    On the determination of carbon isotopic ratios in cool carbon stars II. Accuracy of the iso-intensity method for crowded spectra1999In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 346, no 2, p. 520-522Article in journal (Refereed)
    Abstract [en]

    de Laverny & Gustafsson (1998, Paper 1) questioned the iso-intensity method used by Ohnaka & Tsuji (1996) to derive carbon isotopic ratios in cool carbon stars. As a reply Ohnaka & Tsuji (1998) pointed out that the method criticized in Paper I differs fro

  • 34.
    Denchev, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Magnusson, P
    Donchev, Z
    Lightcurves of nine asteroids, with pole and sense of rotation of 42 Isis1998In: PLANETARY AND SPACE SCIENCE, ISSN 0032-0633, Vol. 46, no 6-7, p. 673-682Article in journal (Other scientific)
    Abstract [en]

    The results of photometric observations of 9 asteroids collected from 1991 to 1997 are presented. The observations have been conducted at Belogradchik and Rozhen observatories, Bulgaria. For 42 Isis a spin pole determination has been performed: we derive

  • 35.
    Edvardsson, Bengt
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Faculty of Science and Technology, Astronomical observatory.
    Det kosmiska kretsloppet - om stjärnornas liv och atomernas historia2000Other (Other (popular scientific, debate etc.))
  • 36.
    Edvardsson, Bengt
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Andersen, Johannes
    Gustafsson, Bengt
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Lambert, David L.
    Nissen, Poul Erik
    Tomkin, Jocelyn
    The chemical evolution of the galactic disk1993In: Astronomy & Astrophysics, ISSN 0004-6361, Vol. 275, p. 101-152Article in journal (Refereed)
  • 37.
    EDVARDSSON, Bengt
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    PETTERSSON, Bertil
    KHARRAZI, Maryam
    WESTERLUND, Bengt
    ABUNDANCE ANALYSIS AND ORIGIN OF THE ZETA-SCULPTORIS OPEN CLUSTER1995In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 293, no 1, p. 75-86Article in journal (Refereed)
    Abstract [en]

    We have determined chemical abundances and radial velocities for stars in the field of the zeta Sculptoris cluster. We find that the cluster metal deficiency previously found from UBV photometry is not supported; the cluster overall metallicity, [Fe/H] =

  • 38.
    Ekholm, A.G.
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Dahlgren, M.Lagerkvist, C.-I.Lagerros, J.Lundström, M.Magnusson, PWarell, J.
    VRI photometry of Kuiper belt objects and Centaurs1999In: 30th Annual Lunar and Planetary Science Conference, March 15-29, 1999, Houston, TX, abstract no. 1714Conference proceedings (editor) (Other scientific)
  • 39.
    Erikson, A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Berthier, J
    Denchev, PV
    Harris, AW
    Ioannou, Z
    Kryszczynska, A
    Lagerkvist, CI
    Magnusson, P
    Michalowski, T
    Nathues, A
    Piironen, J
    Pravec, P
    Sarounova, L
    Velichko, F
    Photometric observations and modelling of the asteroid 85 Io in conjunction with data from an occultation event during the 1995-96 apparition1999In: PLANETARY AND SPACE SCIENCE, ISSN 0032-0633, Vol. 47, no 3-4, p. 327-330Article in journal (Refereed)
    Abstract [en]

    The asteroid 85 Io has been observed using CCD and photoelectric photometry on 18 nights during its 1995-96 and 1997 apparitions. We present the observed lightcurves, determined colour indices and modelling of the asteroid spin vector and shape. The colou

  • 40.
    Feltzing, Sofia
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Gustafsson, Bengt
    Abundances in metal-rich stars - Detailed abundance analysis of 47 G and K dwarf stars with [Me/H]> 0.10 dex1998In: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, ISSN 0365-0138, Vol. 129, no 2, p. 237-266Article in journal (Refereed)
    Abstract [en]

    We have derived elemental abundances of O, Na, Mg, Al, Si, Ca, Ti, Cr, Mn, Fe, Co, Ni as well as for a number of s-elements for 47 G and K dwarf, with [Me/H]> 0.1 dex. The selection of stars was based on their kinematics as well as on their uvby - beta ph

  • 41.
    Feltzing, Sofia
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Gustafsson, Bengt
    The metal-rich disk population - Oxygen abundances1996In: NEW LIGHT ON GALAXY EVOLUTION, ISSN 0074-1809, no 171, p. 372-372Article in journal (Other scientific)
  • 42.
    Garcia, Lopez Ramon J
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Lambert, David L
    Edvardsson, Bengt
    Gustafsson, Bengt
    Kiselman, Dan
    Rebolo, Rafael
    Boron in very metal-poor stars1998In: ASTROPHYSICAL JOURNAL, ISSN 0004-637X, Vol. 500, no 1, p. 241-256Article in journal (Refereed)
    Abstract [en]

    We have observed the B I lambda 2497 line to derive the boron abundances of two very metal-poor stars selected to help in tracing the origin and evolution of this element in the early Galaxy: BD +23 degrees 3130 and HD 84937. The observations were conduct

  • 43.
    Gierlinski, M
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Zdziarski, AA
    Coppi, PS
    Poutanen, Juri
    Ebisawa, K
    Johnson, WN
    Thermal/non-thermal model of Cyg X-1 in the soft state1999In: NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS, ISSN 0920-5632, Vol. 69, no 1-3, p. 312-315Article in journal (Refereed)
  • 44.
    Gratton, RG
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Carretta, E
    Eriksson, Kjell
    Gustafsson, Bengt
    Abundances of light elements in metal-poor stars - II. Non-LTE abundance corrections1999In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 350, no 3, p. 955-969Article in journal (Refereed)
    Abstract [en]

    We present non-LTE corrections to abundances of Fe, O, Na, and Mg derived from LTE analyses of F-K stars over a broad range of gravities and metal abundances; they were obtained using statistical equilibrium calculations and new model atoms. Line opacity

  • 45.
    Gunnarsson, M.
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Faculty of Science and Technology, Astronomical observatory.
    Bockelée-Morvan, D.
    Winnberg, A.
    Rickman, H.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Physics, Department of Astronomy and Space Physics. Faculty of Science and Technology, Astronomical observatory.
    Crovisier, J.
    Biver, N.
    Colom, P.
    Davies, J.K.
    Despois, D.
    Henry, F.
    Johansson, L.E.B.
    Moreno, R.
    Paubert, G.
    Rantakyrö, F.T.
    Rauer, H.
    Production and Kinematics of CO in Comet 1995 O1 (Hale-Bopp) at Large Post-Perihelion Distances2003In: Astronomy & Astrophysics, Vol. 402, p. 383-393Article in journal (Refereed)
  • 46.
    Gustafsson, B
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Spite, M
    Bessell, M
    Bell, R
    Kurucz, R
    Megessier, C
    Wehrse, R
    What do we do when models don't fit? On model atmospheres and real stellar spectra1997In: FUNDAMENTAL STELLAR PROPERTIES: THE INTERACTION BETWEEN OBSERVATION AND THEORY, ISSN 0074-1809, no 189, p. 261-276Article in journal (Other scientific)
    Abstract [en]

    Developments in the modelling of stellar atmospheres and results from the confrontation between calculated and observed fluxes and spectra are discussed. It is argued that, although impressive advances in the study of O-type, WR and cool star spectra have

  • 47.
    Gustafsson, Bengt
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    High-precision astrometry and the modelling of stellar spectra1995In: ASTRONOMICAL AND ASTROPHYSICAL OBJECTIVES OF SUB-MILLIARCSECOND OPTICAL ASTROMETRY, ISSN 0074-1809, no 166, p. 143-148Article, review/survey (Other (popular scientific, debate etc.))
    Abstract [en]

    The impact of high-precision astrometry on modelling of stellar spectra and determination of fundamental stellar parameters for single stars is discussed. It is found to be considerable, but improvements in the understanding of stellar atmospheres, and in

  • 48.
    Gustafsson, Bengt
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Is the Sun a Sun-like star?1998In: SPACE SCIENCE REVIEWS, ISSN 0038-6308, Vol. 85, no 1-2, p. 419-428Article in journal (Other scientific)
    Abstract [en]

    Various observable properties of the Sun are compared with those of solar-type stars. It is concluded that the Sun, to a remarkable degree, is "solar-type". As regards its particular mass and age, and probably its non-binarity, "anthropic" explanations ma

  • 49.
    Gustafsson, Bengt
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Molecules in stellar atmospheres1998In: ASTROPHYSICS AND SPACE SCIENCE, ISSN 0004-640X, Vol. 255, no 1-2, p. 241-249Article, review/survey (Other (popular scientific, debate etc.))
    Abstract [en]

    The effects of molecules on model stellar atmospheres are briefly reviewed. Molecular diagnostics of stellar fundamental parameters and of atmospheric structure are discussed, and the presently emerging "ISO picture" of the outer regions of stars is comme

  • 50.
    Gustafsson, Bengt
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Astronomical observatory.
    Eriksson, Kjell
    Kiselman, D
    Olander, N
    Olofsson, H
    KI emission from envelopes around N-type stars - Spectroscopic observations and interpretations1997In: ASTRONOMY AND ASTROPHYSICS, ISSN 0004-6361, Vol. 318, no 2, p. 535-542Article in journal (Refereed)
    Abstract [en]

    Circumstellar envelopes around three bright N-type stars, R Scl, X TrA, and V Aql have been detected in emission in resonance lines from K I. This radiation, which is most probably scattered photospheric radiation, was first found spectroscopically, but h

1234 1 - 50 of 177
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf