Non-LTE Analysis of the Oxygen lambda lambda 7771--5 Triplet in Mid-G through Early-K Giants

Details Non-LTE Analysis of the Oxygen lambda lambda 7771--5 Triplet in Mid-G through Early-K Giants Non-LTE Analysis of the Oxygen lambda lambda 7771--5 Triplet in Mid-G through Early-K Giants

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasj...50...97t&link_type=abstract

Publications of the Astronomical Society of Japan, v.50, p.97-109.

Astronomy and Astrophysics

Astronomy

16

Line Formation, Stars: Abundances (Oxygen), Stars: Atmospheres, Stars: Giants, Stars: Late-Type

Scientific paper

An extensive spectral-synthesis analysis in the neighborhood of the O I 7771--5 lines (including also the lines of Fe I, Nd II, and CN) was carried out for thirty-two giant stars at the spectral type of mid-G through early-K, and their photospheric oxygen abundances were derived from these triplet lines based on detailed statistical-equilibrium calculations, aiming to assess the importance of the non-LTE effect quantitatively as well as to examine the reliability of the abundances derived from this near-IR triplet compared to those obtained from the forbidden line widely invoked. It turned out that the expected (negative) non-LTE correction ranges from 0.1 to 0.2 dex, the extent of which is somewhat smaller than has been reported by Eriksson and Toft (1979, AAA 25.114.007). The resulting non-LTE abundances were found to agree in most cases with those determined from the published equivalent widths of the forbidden O I 6300 line with no serious systematic descrepancy, though some showing appreciable scatters. The possible sources of uncertainties in oxygen-abundance determination are further examined, and the relevant characteristics of the resulting abundances, such as the [O/Fe] ratio in G--K giants, are discussed.

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