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Stellar Abundance Analyses in the Light of 3D Hydrodynamical Model Atmospheres

Published online by Cambridge University Press:  26 May 2016

Martin Asplund
Martin Asplund*
Affiliation:
Research School of Astronomy and Astrophysics, Mt Stromlo Observatory, Cotter Road, Weston, ACT 2611, Australia

Abstract

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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.

Type
Session E. Comparison with Observations
Information
Symposium - International Astronomical Union , Volume 210: Modelling of Stellar Atmospheres , 2003 , pp. 273 - 286
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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