Formation of Li I lines in photospheric granulation
arXiv:astro-ph/9708198 · doi:10.1086/310946
Abstract
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.
9 pages Latex (AASTeX using aaspp4.sty) with 3 figures (PS). The former EPS figures have been replaced with safer PS due to technical problems encountered by some users. No change in content. Accepted for publication in Astrophysical Journal Letters
References in corpus (1)
Cited by in corpus (14)
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