Oxygen line formation in 3D hydrodynamical model atmospheres
Abstract
The formation of [O I], O I and OH lines in metal-poor stars has been studied by means of 3D hydrodynamical model atmospheres. For O I detailed 3D non-LTE calculations have been performed. While the influence of 3D model atmospheres is minor for [O I] and O I lines, the very low temperatures encountered at low metallicities have a drastic impact on OH. As a result, the derived O abundances are found to be systematically overestimated in 1D analyses, casting doubts on the recent claims for a monotonic increase in [O/Fe] towards lower metallicities.
- Publication:
-
Highlights of Astronomy
- Pub Date:
- 2002
- Bibcode:
- 2002HiA....12..432A
- Keywords:
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- Oxygen Lines;
- Line Formation;
- Model Atmospheres