Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...353..978m&link_type=abstract
Astronomy and Astrophysics, v.353, p.978-986 (2000)
Astronomy and Astrophysics
Astrophysics
55
Atomic Processes, Line: Formation, Line: Profiles, Methods: Numerical, Stars: Abundances, Stars: Atmospheres
Scientific paper
Oxygen abundance for 14 halo stars through the O I 7774 Ätriplet have been derived from high resolution spectra (R = 25,000; S/N > 100) obtained with echelle-spectrometer of 6-m telescope of Special Astrophysical Observatory of the Russian Academy of Sciences. The effective temperature, metallicity and other parameters have been examined. For example, the effective temperature was found from H_alpha line wings and photometric indices. The abundance analysis was carried out using both LTE and non-LTE conceptions. For this aim, we have specified the oxygen atomic model. The average [O/Fe] value appeared to be 0.61 +/- 0.21 from the non-LTE determination. A trend of oxygen abundance increasing along with the iron abundance decreasing was found. The relation between [O/Fe] and [Fe/H] is linear: [O/Fe]=-0.370x[Fe/H]+0.047. In addition to the sample of our program stars, we also involved in the analysis, 24 targets from Cavallo et al. (\cite{Cav}). For their original results we have determined the necessary non-LTE corrections. Our data are compared with the results of other works (Tomkin et al., \cite{Tom}; King & Boesgaard, \cite{King2}; Boesgaard et al. \cite{BK2}).
Klochkova Valentina G.
Korotin Sergey A.
Mishenina Tamara V.
Panchuk Vladimir E.
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