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Precise Li abundances in metal-poor stars: depletion in the Spite plateau

Published online by Cambridge University Press:  09 March 2010

J. Meléndez ,
L. Casagrande ,
I. Ramírez  and
M. Asplund
J. Meléndez
Affiliation:
Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
L. Casagrande
Affiliation:
Max-Planck-Institut für Astrophysik, Germany
I. Ramírez
Affiliation:
Max-Planck-Institut für Astrophysik, Germany
M. Asplund
Affiliation:
Max-Planck-Institut für Astrophysik, Germany
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Abstract

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We present Li abundances for 73 stars in the metallicity range −3.5 < [Fe/H] < −1.0 using improved IRFM temperatures (Casagrande et al. 2009) with precise E(B-V) values obtained mostly from interstellar NaI D lines, and high-quality equivalent widths (σEW ~ 3%). At all metallicities we uncover a fine-structure in the Li abundances of Spite plateau stars, which we trace to Li depletion that depends on both metallicity and mass. Models including atomic diffusion and turbulent mixing seem to reproduce the observed Li depletion assuming a primordial Li abundance ALi = 2.64 dex (MARCS models) or 2.72 (Kurucz overshooting models), in good agreement with current predictions (ALi = 2.72) from standard BBN.

Keywords

nucleosynthesis – cosmology: observations – stars: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S265: Chemical Abundances in the Universe: Connecting First Stars to Planets , August 2009 , pp. 71 - 72
Copyright
Copyright © International Astronomical Union 2010

References

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