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

Published online by Cambridge University Press:  23 April 2010

Rodolfo Smiljanic ,
L. Pasquini ,
C. Charbonnel  and
N. Lagarde
Rodolfo Smiljanic
Affiliation:
IAG, University of São Paulo, Brazil ESO, Germany, email: [email protected]
L. Pasquini
Affiliation:
ESO, Germany, email: [email protected]
C. Charbonnel
Affiliation:
Geneva Observatory, Switzerland LATT, CNRS, Université de Toulouse, France
N. Lagarde
Affiliation:
Geneva Observatory, Switzerland
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Abstract

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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.

Keywords

Stars: abundancesevolutionrotation – Open clusters and associations: individual: IC 4651
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S268: Light Elements in the Universe , November 2009 , pp. 357 - 358
Copyright
Copyright © International Astronomical Union 2010

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