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Observational signatures of lithium depletion in the metal-poor globular cluster NGC6397

Published online by Cambridge University Press:  23 April 2010

Karin Lind ,
Francesca Primas ,
Corinne Charbonnel ,
Frank Grundahl  and
Martin Asplund
Karin Lind
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Strasse 2, 857 48 Garching bei München, Germany email: klind@eso.org
Francesca Primas
Affiliation:
European Southern Observatory, Karl-Schwarzschild-Strasse 2, 857 48 Garching bei München, Germany email: klind@eso.org
Corinne Charbonnel
Affiliation:
Geneva Observatory, 51 chemin des Mailettes, 1290 Versoix, Switzerland Laboratoire d'Astrophysique de Toulouse-Tarbes, CNRS UMR 5572, Université de Tou louse, 14, Av. E. Belin, F-31400 Toulouse, France
Frank Grundahl
Affiliation:
Department of Physics & Astronomy, Aarhus University, Ny Munkegade, 8000 Aarhus C, Denmark
Martin Asplund
Affiliation:
Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, 857 41 Garching bei München, Germany
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Abstract

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The “stellar” solution to the cosmological lithium problem proposes that surface depletion of lithium in low-mass, metal-poor stars can reconcile the lower abundances found for Galactic halo stars with the primordial prediction. Globular clusters are ideal environments for studies of the surface evolution of lithium, with large number statistics possible to obtain for main sequence stars as well as giants. We discuss the Li abundances measured for >450 stars in the globular cluster NGC 6397, focusing on the evidence for lithium depletion and especially highlighting how the inferred abundances and interpretations are affected by early cluster self-enrichment and systematic uncertainties in the effective temperature determination.

Keywords

stars: abundancesatmospheresevolutionglobular clusters: individual (NGC 6397)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S268: Light Elements in the Universe , November 2009 , pp. 263 - 268
Copyright
Copyright © International Astronomical Union 2010

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