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Solar abundances and 3D model atmospheres

Published online by Cambridge University Press:  09 March 2010

Hans-Günter Ludwig ,
Elisabetta Caffau ,
Matthias Steffen ,
Piercarlo Bonifacio ,
Bernd Freytag  and
Roger Cayrel
Hans-Günter Ludwig
Affiliation:
CIFIST – Marie Curie Excellence Team GEPI – Observatoire de Paris, CNRS, Université Paris Diderot, 92195 Meudon, France
Elisabetta Caffau
Affiliation:
GEPI – Observatoire de Paris, CNRS, Université Paris Diderot, 92195 Meudon, France
Matthias Steffen
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
Piercarlo Bonifacio
Affiliation:
CIFIST – Marie Curie Excellence Team GEPI – Observatoire de Paris, CNRS, Université Paris Diderot, 92195 Meudon, France INAF – Osservatorio Astronomico di Trieste, via Tiepolo 11, 34143 Trieste, Italy
Bernd Freytag
Affiliation:
CIFIST – Marie Curie Excellence Team GEPI – Observatoire de Paris, CNRS, Université Paris Diderot, 92195 Meudon, France CRAL – UMR 5574 CNRS, Université de Lyon, École Normale Supérieure de Lyon, 46 allée d'Italie, 69364 Lyon Cedex 07, France
Roger Cayrel
Affiliation:
GEPI – Observatoire de Paris, CNRS, Université Paris Diderot, 92195 Meudon, France
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Abstract

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We present solar photospheric abundances for 12 elements from optical and near-infrared spectroscopy. The abundance analysis was conducted employing 3D hydrodynamical (CO5BOLD) as well as standard 1D hydrostatic model atmospheres. We compare our results to others with emphasis on discrepancies and still lingering problems, in particular exemplified by the pivotal abundance of oxygen. We argue that the thermal structure of the lower solar photosphere is very well represented by our 3D model. We obtain an excellent match of the observed center-to-limb variation of the line-blanketed continuum intensity, also at wavelengths shortward of the Balmer jump.

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