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

Author:

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

Abstract

AbstractThe “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.

Publisher

Cambridge University Press (CUP)

Subject

Astronomy and Astrophysics,Space and Planetary Science

Reference18 articles.

1. Casagrande L. , Ramírez I. , Meléndez J. , Bessel M. , & Asplund M. 2010, A&A, e-print: http://arxiv.org/abs/1001.3142

2. Atomic Diffusion and Mixing in Old Stars. I. Very Large Telescope FLAMES‐UVES Observations of Stars in NGC 6397

3. Lithium abundance at the formation of the Galaxy

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