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A 3D-NLTE study of the 670 nm solar lithium feature

Published online by Cambridge University Press:  23 April 2010

Elisabetta Caffau ,
Hans-Günter Ludwig ,
Matthias Steffen  and
Piercarlo Bonifacio
Elisabetta Caffau
Affiliation:
GEPI, Observatoire de Paris, CNRS, Université Paris Diderot; 92195 Meudon Cedex, FranceElisabetta.Caffau@obspm.fr
Hans-Günter Ludwig
Affiliation:
GEPI, Observatoire de Paris, CNRS, Université Paris Diderot; 92195 Meudon Cedex, FranceElisabetta.Caffau@obspm.fr ZAH-Landessternwarte, Königstuhl 12, D-69117 Heidelberg, Germany
Matthias Steffen
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany
Piercarlo Bonifacio
Affiliation:
GEPI, Observatoire de Paris, CNRS, Université Paris Diderot; 92195 Meudon Cedex, FranceElisabetta.Caffau@obspm.fr
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Abstract

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We derive the 3D-NLTE lithium abundance in the solar photosphere from the Lii line at 670 nm as measured in several solar atlases. The Li abundance is obtained from line profile fitting with 1D/3D-LTE/3D-NLTE synthetic spectra, considering several possibilities for the atomic parameters of the lines blending the Li feature. The 670 nm spectral region shows considerable differences in the two available disc-centre solar atlases, while the two integrated disc spectra are very similar. We obtain A(Li)3D–NLTE = 1.03. The 1D-LTE abundance is 0.07 dex smaller. The line-lists giving the best fit for the Sun may fail for other stars, while some line-lists fail to reproduce the solar profile satisfactorily. We need a better knowledge of the atomic parameters of the lines blending the Li feature in order to be able to reproduce both the solar spectrum and the spectra of other stars. An improved line-list is also required to derive reliable estimates of the isotopic Li ratio in solar-metallicity stars.

Keywords

Sun: abundances – stars: abundances – hydrodynamics – line: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S268: Light Elements in the Universe , November 2009 , pp. 329 - 330
Copyright
Copyright © International Astronomical Union 2010

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