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Beryllium abundances along the evolutionary sequence of the open cluster IC 4651

Smiljanic, Rodolfo ; Pasquini, L. ; Charbonnel, C. ; Lagarde, N.

In: Proceedings of the International Astronomical Union, 2009, vol. 5, no. S268, p. 357-358

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    Titel
    • Beryllium abundances along the evolutionary sequence of the open cluster IC 4651
    Autor
    • Smiljanic, Rodolfo. IAG, University of São Paulo, Brazil
    • Pasquini, L.. ESO, Germany, email: rsmiljan@eso.org
    • Charbonnel, C.. Geneva Observatory, Switzerland
    • Lagarde, N.. Geneva Observatory, Switzerland
    Dokumententyp
    • Postprint
    Sprache
    • Englisch
    Veröffentlicht in
    • Proceedings of the International Astronomical Union, 2009, vol. 5, no. S268, p. 357-358. Cambridge University Press
    Andere elektronische Ausgabe
    OAI-PMH-ID
    • oai:doc.rero.ch:297752
    Summary
    The simultaneous investigation of Li and Be in stars is a powerful tool in the study of the evolutionary mixing processes. Here, we present beryllium abundances in stars along the whole evolutionary sequence of the open cluster IC 4651. This cluster has a metallicity of [Fe/H] = +0.11 and an age of 1.2 or 1.7 Gyr. Abundances have been determined from high-resolution, high signal-to-noise UVES spectra using spectrum synthesis and model atmospheres. Lithium abundances for the same stars were determined in a previous work. Confirming previous results, we find that the Li dip is also a Be dip. For post-main-sequence stars, the Be dilution starts earlier within the Hertzsprung gap than expected from classical predictions, as does the Li dilution. Theoretical hydrodynamical models are able to reproduce well all the observed features