Formation of Li I lines in photospheric granulation

Details Formation of Li I lines in photospheric granulation Formation of Li I lines in photospheric granulation

1997-08-21

arxiv.org/abs/astro-ph/9708198v2

Astronomy and Astrophysics

Astrophysics

9 pages Latex (AASTeX using aaspp4.sty) with 3 figures (PS). The former EPS figures have been replaced with safer PS due to te

Scientific paper

10.1086/310946

The possibility of significant systematic errors due to the use of 1D homogeneous atmospheres in lithium-abundance determinations of cool stars motivates a study of non-local-thermodynamic-equilibrium (NLTE) effects on Li I line formation in a 3D solar-granulation simulation snapshot. The NLTE effect on the equivalent width of the 671 nm resonance line is small in 1D models or in integrated light from the granulation model. The line-strength variations over the granulation pattern are however markedly different in NLTE compared to LTE -- observations of this may provide diagnostics to NLTE effects. The effects of horizontal photon exchange found in the granulation model are moderate and due entirely to bound-bound processes, ultraviolet overionization is unimportant.

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