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3D modeling of stellar atmospheres and the impact on the understanding of the reliability of elemental abundances in stars as tracers of galactic chemical evolution

Published online by Cambridge University Press:  06 January 2014

H.-G. Ludwig ,
M. Steffen ,
P. Bonifacio ,
E. Caffau ,
A. Kučinskas  and
B. Freytag
H.-G. Ludwig
Affiliation:
Zentrum für Astronomie der Universität Heidelberg, Landessternwarte, Königstuhl 12, D-69117 Heidelberg, Germany GEPI Observatoire de Paris, CNRS, Université Paris Diderot, F-92195 Meudon Cedex, France
M. Steffen
Affiliation:
Leibniz Institut für Astrophysik Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany
P. Bonifacio
Affiliation:
GEPI Observatoire de Paris, CNRS, Université Paris Diderot, F-92195 Meudon Cedex, France
E. Caffau
Affiliation:
Zentrum für Astronomie der Universität Heidelberg, Landessternwarte, Königstuhl 12, D-69117 Heidelberg, Germany GEPI Observatoire de Paris, CNRS, Université Paris Diderot, F-92195 Meudon Cedex, France
A. Kučinskas
Affiliation:
Vilnius University Institute of Theoretical Physics and Astronomy, A. Goštauto 12, Vilnius LT-01108, Lithuania
B. Freytag
Affiliation:
Centre de Recherche Astrophysique de Lyon, UMR 5574, CNRS, Université de Lyon, École Normale Supérieure de Lyon, 46 allée d'Italie, F-69364 Lyon Cedex 07, France
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Abstract

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We present a critical review of the construction of 3D model atmospheres with emphasis on modeling challenges. We discuss the basic physical processes which give rise to the effects which set 3D models apart from 1D standard models. We consider elemental abundances derived from molecular features, and the determination of the microturbulence with 3D models. The examples serve as illustration of the limitations inherent to 1D, however, also to 3D modeling. We find that 3D models can provide constraints on the microturbulence parameter, and predict substantial corrections for abundances derived from molecular species.

Keywords

stars: late-typestars: atmospheresstars: abundancesradiative transferconvectionhydrodynamicsline: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S298: Setting the scene for Gaia and LAMOST , May 2013 , pp. 343 - 354
Copyright
Copyright © International Astronomical Union 2014 

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