Effects of NLTE and granulation on LiBeB abundance determinations

Details Effects of NLTE and granulation on LiBeB abundance determinations Effects of NLTE and granulation on LiBeB abundance determinations

1999-02-26

arxiv.org/abs/astro-ph/9902375v1

Astronomy and Astrophysics

Astrophysics

11 pages, latex, 2 figures. To appear in the Proceedings of the Workshop "LiBeB, Cosmic Rays and Gamma-Ray Line Astronomy", Pa

Scientific paper

NLTE effects - the errors caused by assuming local thermodynamic equilibrium (LTE) - on LiBeB abundance determinations for cool stars are discussed. These NLTE effects are significant in many cases for B I and Li I lines. The Be II 313 nm lines are not formed under LTE circumstances, but the NLTE effects on equivalent widths seem to be rather small. Reasons for doing LTE abundance analysis are discussed and confronted with the reasons for doing NLTE abundance analysis. The impact of three-dimensional photospheric inhomogeneity on line formation is discussed - there are not many definite results on this yet, but there may be soon.

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