Stellar abundance analyses in the light of 3D hydrodynamical model atmospheres

Details Stellar abundance analyses in the light of 3D hydrodynamical model atmospheres Stellar abundance analyses in the light of 3D hydrodynamical model atmospheres

2003-02-20

arxiv.org/abs/astro-ph/0302407v1

Astronomy and Astrophysics

Astrophysics

Invited talk at IAU Symposium 210 "Modelling of Stellar Atmospheres", Uppsala, Sweden (12 pages)

Scientific paper

I describe recent progress in terms of 3D hydrodynamical model atmospheres and 3D line formation and their applications to stellar abundance analyses of late-type stars. Such 3D studies remove the free parameters inherent in classical 1D investigations (mixing length parameters, macro- and microturbulence) yet are highly successful in reproducing a large arsenal of observational constraints such as detailed line shapes and asymmetries. Their potential for abundance analyses is illustrated by discussing the derived oxygen abundances in the Sun and in metal-poor stars, where they seem to resolve long-standing problems as well as significantly alter the inferred conclusions.

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