Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...312..966r&link_type=abstract
Astronomy and Astrophysics, v.312, p.966-972
Astronomy and Astrophysics
Astrophysics
40
Atomic Data, Stars: Abundances, Stars: Early-Type
Scientific paper
The statistical equilibrium of iron and carbon is investigated for main sequence stars ranging from effective temperatures of 7000K to 12000K, gravities of logg=3.5 to logg=4.5 and metallicities of [M/H]=-0.5 to [M/H]=+1.0. The non-LTE abundance corrections for iron are always positive over the whole range of effective temperatures, gravities and metallicities. They show a pronounced maximum whose position and strength depend strongly on the basic atmospheric parameters. In the case of carbon non-LTE effects depend basically on equivalent width. Up to an effective temperature of 10000 K the non-LTE abundance corrections are always negative. In hotter atmospheres (T_eff_>10000K) the carbon model atom developed by Stuerenburg & Holweger (1990) has been tentatively extended by including additional CII levels and transitions. However, this turns out to have little effect on the statistical equilibrium and non-LTE abundance corrections for neutral carbon.
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