Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005omeg.conf..485t&link_type=abstract
ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 2003. Held 17-19 November 2003 in RIKEN, Wako, Saitama, Japan. Edited by M Terasawa,
Astronomy and Astrophysics
Astronomy
Scientific paper
Preliminary LTE and non-LTE (NLTE) analyses of oxygen (O) abundances were carried out for the 19 metal-poor stars and the two normal stars, Procyon and the Sun, based on high-resolution, high-signal-to-noise spectra obtained with OAO/HIDES as well as on the ELODIE spectral database. The forbidden lines [O I] 6300/6363 Å were analyzed on LTE assumption, while the triplet lines O I 7772-5 Å were corrected for NLTE effects. Our main results are: (1) NLTE [O/Fe] derived from the triplet lines distribute almost flat with an average of ~ 0.75 dex in the range of [Fe/H]< -1, while those from the forbidden lines seem to show an increasing trend with decreasing [Fe/H], which must be confirmed by a further detailed study. (2) The triplet-line NLTE [O/Fe] are systematically larger than the forbidden-line [O/Fe] by an average of ~ 0.35 dex in the range of -2 <[Fe/H]< 0.
Chiyo N.
Saito Y.-J.
Takada-Hidai Masahide
Takeda Yukiharu
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