Abundances of alpha -elements in the ultra-metal-poor giants CS29498-043 and CS22949-037.

Bibcode
2004MmSAI..75...40I
Israelian, G.
Bibliographical reference

Memorie della Società Astronomica Italiana, v.75, p.40 (2004)

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0
2004
Number of authors
1
IAC number of authors
1
Citations
0
Refereed citations
0
Description
We discuss abundances of alpha -elements in the ultra-metal-poor giants CS29498-043 and CS22949-037. The abundance of oxygen has been derived from measurements of the oxygen triplet at 7771-5 Å in high resolution and high S/N ratio near-IR spectra obtained with KeckI/HIRES. A detailed non-LTE analysis of Fe lines has been carried to provide more reliable stellar parameters. A non-LTE analysis of O and Mg allowed us to demonstrate the failure of standard 1D atmospheric models to describe the physical conditions in the line-forming regions of our targets.
Type
Non-refereed

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