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1997PASP..109..226C - Publ. Astron. Soc. Pac., 109, 226-235 (1997/March-0)

Oxygen abundances in metal poor subgiant stars from the O I triplet.


Abstract (from CDS):

This paper examines the oxygen abundance of 24 main-sequence turn-off and subgiant stars through the permitted O I triplet near λ7774 Å. In agreement with prior investigators, we find that the O abundance from the triplet is about 0.53 dex higher than is typically found from other means such as the [O I] λ6300 Å line or the UV and IR bands from OH. Our average [O/Fe] is +0.79 ± 0.29 (1 σ), with the uncertainties in the individual methods being dominated by systematic errors in our incomplete understanding of the formation of these high excitation lines under non-LTE conditions. Several methods of resolving the on-going discrepancy are discussed in detail. We find that the problem is not fixed by simply changing the model atmosphere parameters, and that the best methods seem to require a detailed non-LTE analysis based on both the structure of the oxygen atom and the source function within and above the photosphere. The trend of increasing O with decreasing Fe is briefly explored and is found to be qualitatively consistent with other works.

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Journal keyword(s): Stars

Simbad objects: 24

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