Tag Archives: abundance

Stellar laboratories III. New Ba V, Ba VI, and Ba VII oscillator strengths and the barium abundance in the hot white dwarfs G191-B2B and RE0503-289

T. Rauch (1), K. Werner (1), P. Quinet (2,3), J. W. Kruk (4) (1) Institute for Astronomy and Astrophysics, Eberhard Karls University, Tuebingen, Germany, (2) Astrophysique et Spectroscopie, Universite de Mons – UMONS, Belgium, (3) IPNAS, Universite de Liege, Liege, … Continue reading

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Temperature fluctuations in ionized nebulae and their effect on the oxygen abundance determination

Antonio Peimbert (Instituto de Astronomia–UNAM, Mexico) The two most common ways of determining chemical abundances on ionized regions are: 1.- the one that comes from assuming homogeneous temperature and using the observed collisionally excited line ratios (the direct method) and … Continue reading

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Oxygen abundance determinations in OB dwarfs and supergiants

Miguel A. Urbaneja (University of Hawaii, Institute for Astronomy, USA) OB type stars are part of a young stellar population in star-forming galaxies that is coeval with H II regions. Their optical spectra present a large number of oxygen lines, … Continue reading

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Oxygen in cool stars according to CO5BOLD

Hans-­Guenter Ludwig (ZAH -­ Landessternwarte, Germany) In recent years 3D stellar atmosphere models computed with the CO5BOLD code have been applied to determine the abundance of oxygen in cool stars — the Sun and metal-poor stars as prime examples. I … Continue reading

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The lithium problem, a phenomenologist’s perspective

Fabio Iocco (The Oskar Klein Center for CosmoParticle Physics, Department of Physics, Stockholm University, Albanova, SE-10691 Stockholm, Sweden) Thirty years after the first observation of the 7Li isotope in the atmosphere of metal-poor halo stars, the puzzle about its origin … Continue reading

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Stellar Models with Enhanced Abundances of C, N, O, Ne, Na, Mg, Si, S, Ca, and Ti, in Turn, at Constant Helium and Iron Abundances

Don A. VandenBerg (1), Peter A. Bergbusch (2), Aaron Dotter (3), Jason W. Ferguson (4), Georges Michaud (5), Jacques Richer (6) & Charles R. Proffitt (7) ((1) Department of Physics & Astronomy, University of Victoria, P.O. Box 3055, Victoria, B.C., … Continue reading

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Direct Oxygen Abundances for Low Luminosity LVL Galaxies

Danielle A. Berg (1), Evan D. Skillman (1), Andrew R. Marble (2,3), Liese van Zee (4), Charles W. Engelbracht (2), Janice C. Lee (5), Robert C. Kennicutt, Jr. (6,7), Daniela Calzetti (8), Daniel A. Dale (9), and Benjamin D. Johnson … Continue reading

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