Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pasj...49..471t&link_type=abstract
Publications of the Astronomical Society of Japan, v.49, p.471-479.
Astronomy and Astrophysics
Astronomy
18
Line Formation, Stars: Abundances, Stars: Atmospheres, Stars: Early-Type, Stars: Population Ii
Scientific paper
The non-LTE formation of neutral oxygen lines in the visible (lambda 6156--8) and near-IR (lambda 7771--5) region was studied, and extensive grids of theoretical non-LTE equivalent widths and abundance corrections were computed in the parameter range of -2 <= [Fe/H] <= 0, 7000 K <=T_eff <= 14000 K, and 3.0 <= log g <= 4.0, with the intention of applying them to A-type stars, especially Population-II stars such as horizontal-branch objects. It was found that the inclusion of UV Lyman lines (such as Lyman beta overlapping with a strong OI resonance transition) in the background opacity may be important, which tends to suppress the non-LTE effect, especially for the metal-deficient case. Nevertheless, the resulting non-LTE correction for OI 7771--5 is still of considerable amount (>~ 0.5--1.0 dex), even in the weak-line cases of low abundance, and should inevitably be taken into account when determining oxygen abundance from this near-IR triplet.
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