Hostname: page-component-848d4c4894-nmvwc Total loading time: 0 Render date: 2024-06-28T04:19:31.298Z Has data issue: false hasContentIssue false

The Status of Oxygen Abundances in Metal-Poor Stars

Published online by Cambridge University Press:  30 March 2016

Ruth C. Peterson*
Affiliation:
Astrophysical Advances and UCO/Lick Observatories

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The sensitivity of various methods of oxygen-abundance determination to the structure of the model atmosphere in a classical analysis is described, with emphasis on the treatment of convection. Oxygen-abundance results presented during this meeting are outlined. Because the oxygen diagnostics are sensitive in different ways to the choice of model stellar parameters and to the treatment of convection, it is not surprising that different methods applied by different groups give different results. Most are consistent with an increase in [O/Fe] as [Fe/H] declines, but the slope is uncertain still, and the scatter is large at very low abundances. The trend may continue to low [Fe/H], but more stars and more checks are needed.

Type
II. Joint Discussions
Copyright
Copyright © Astronomical Society of Pacific 2002

References

Castelli, F., Gratton, R.G., & Kurucz, R.L. 1997, A&A, 318, 841 Google Scholar
Gray, D.F. 1992, The Observation and Analysis of Stellar Photospheres (Cambridge: Cambridge Univ. Press)Google Scholar
Kurucz, R.L. 1993, ATLAS9 Stellar Atmosphere Programs and 2 km s−1 Grid (Kurucz CD-ROM No. 13)Google Scholar
Kurucz, R.L. 1994, Solar Abundance Model Atmospheres of 0,1,2,4,8 km s−1 (Kurucz CD-ROM No. 19)Google Scholar
Kurucz, R.L. 1995, updated model grids posted at http://cfaku5.harvard.edu Google Scholar
Peterson, R.C., Dorman, B., & Rood, R.T. 2000, ApJ, submitted (astro-ph/0009208), and in preparationGoogle Scholar
Thévenin, F., & Idiart, T.P. 1999, ApJ, 521, 753 CrossRefGoogle Scholar