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

Lind, Karin ; Primas, Francesca ; Charbonnel, Corinne ; Grundahl, Frank ; Asplund, Martin

In: Proceedings of the International Astronomical Union, 2009, vol. 5, no. S268, p. 263-268

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    Titre
    • Observational signatures of lithium depletion in the metal-poor globular cluster NGC6397
    Auteur
    • Lind, Karin. European Southern Observatory, Karl-Schwarzschild-Strasse 2, 857 48 Garching bei München, Germany email: klind@eso.org
    • Primas, Francesca. European Southern Observatory, Karl-Schwarzschild-Strasse 2, 857 48 Garching bei München, Germany email: klind@eso.org
    • Charbonnel, Corinne. Geneva Observatory, 51 chemin des Mailettes, 1290 Versoix, Switzerland
    • Grundahl, Frank. Department of Physics & Astronomy, Aarhus University, Ny Munkegade, 8000 Aarhus C, Denmark
    • Asplund, Martin. Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, 857 41 Garching bei München, Germany
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Proceedings of the International Astronomical Union, 2009, vol. 5, no. S268, p. 263-268. Cambridge University Press
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:289320
    Summary
    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