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The metal–poor end of the Spite plateau: gravity sensitivity of the Hα wings fitting.

Published online by Cambridge University Press:  23 April 2010

L. Sbordone ,
P. Bonifacio ,
E. Caffau ,
H.-G. Ludwig ,
N. Behara ,
J. I. Gonzalez-Hernandez ,
M. Steffen ,
R. Cayrel ,
B. Freytag  and
C. Van't Veer
...Show all authors
L. Sbordone
Affiliation:
CIFIST Marie Curie Excellence Team GEPI – Observatoire de Paris – France Max-Planck Institut für Astrophysik, Garching – Germany
P. Bonifacio
Affiliation:
CIFIST Marie Curie Excellence Team GEPI – Observatoire de Paris – France INAF – Osservatorio Astronomico di Trieste – Italy
E. Caffau
Affiliation:
GEPI – Observatoire de Paris – France
H.-G. Ludwig
Affiliation:
CIFIST Marie Curie Excellence Team GEPI – Observatoire de Paris – France
N. Behara
Affiliation:
CIFIST Marie Curie Excellence Team GEPI – Observatoire de Paris – France
J. I. Gonzalez-Hernandez
Affiliation:
CIFIST Marie Curie Excellence Team GEPI – Observatoire de Paris – France Universidad Complutense de Madrid – Spain
M. Steffen
Affiliation:
Astrophysikalische Institut Pottsdam – Germany
R. Cayrel
Affiliation:
GEPI – Observatoire de Paris – France
B. Freytag
Affiliation:
Centre de Recherche Astrophisique de Lyon, UMR 5574 – France
C. Van't Veer
Affiliation:
GEPI – Observatoire de Paris – France
P. Molaro
Affiliation:
INAF – Osservatorio Astronomico di Trieste – Italy
B. Plez
Affiliation:
Université Montpellier 2 – France
T. Sivarani
Affiliation:
Indian Institute of Astrophysiscs, Bangalore – India
M. Spite
Affiliation:
GEPI – Observatoire de Paris – France
F. Spite
Affiliation:
GEPI – Observatoire de Paris – France
T. C. Beers
Affiliation:
Michigan State University and JINA, Lansing, MI – USA
N. Christlieb
Affiliation:
Landessternwarte Heidelberg – Germany
P. François
Affiliation:
GEPI – Observatoire de Paris – France
V. Hill
Affiliation:
GEPI – Observatoire de Paris – France Cassiopée, Observatoire de la Cote d'Azur, Nice – France
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Abstract

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We recently presented (Sbordone et al., 2009a) the largest sample to date of lithium abundances in extremely metal-poor (EMP) Halo dwarf and Turn-Off (TO) stars. One of the most crucial aspects in estimating Li abundances is the Teff determination, since the Li I 670.8 nm doublet is highly temperature sensitive. In this short contribution we concentrate on the Teff determination based on Hα wings fitting, and on its sensitivity to the chosen stellar gravity.

Keywords

Nuclear reactionsnucleosynthesis – Galaxy: halo – stars: abundancesPopulation II
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S268: Light Elements in the Universe , November 2009 , pp. 355 - 356
Copyright
Copyright © International Astronomical Union 2010

References

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