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arxiv: astro-ph/0610077 · v1 · submitted 2006-10-03 · 🌌 astro-ph

New Abundances for Old Stars - Atomic Diffusion at Work in NGC 6397

A.J. Korn (1) , F. Grundahl (2) , O. Richard (3) , P.S. Barklem (1) , L. Mashonkina (4) , R. Collet (1) , N. Piskunov (1) , B. Gustafsson (1) ((1) Department of Astronomy
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Space Physics Uppsala University Sweden; (2) Department of Physics Astronomy University of Aarhus Aarhus Denmark; (3) 3GRAAL-UMR5024/ISTEEM (CNRS) Universite Montpellier II Montpellier France; (4) Institute of Astronomy Russian Academy of Science Moscow Russia)
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keywords abundancesstarsatomicdiffusionabundanceanalysisbangcaused
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A homogeneous spectroscopic analysis of unevolved and evolved stars in the metal-poor globular cluster NGC 6397 with FLAMES-UVES reveals systematic trends of stellar surface abundances that are likely caused by atomic diffusion. This finding helps to understand, among other issues, why the lithium abundances of old halo stars are significantly lower than the abundance found to be produced shortly after the Big Bang.

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