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A study of AGB stars in LMC clusters

Published online by Cambridge University Press:  01 July 2008

Thomas Lebzelter
Affiliation:
Department of Astronomy, University of Vienna, Türkenschanzstraße 17, A-1180 Vienna, Austria email: lebzelter@astro.univie.ac.at
Michael T. Lederer
Affiliation:
Department of Astronomy, University of Vienna, Türkenschanzstraße 17, A-1180 Vienna, Austria email: lebzelter@astro.univie.ac.at
Sergio Cristallo
Affiliation:
INAF, Teramo, Italy email: straniero@oa-teramo.inaf.it
Oscar Straniero
Affiliation:
INAF, Teramo, Italy email: straniero@oa-teramo.inaf.it
Kenneth H. Hinkle
Affiliation:
NOAO, Tucson, USA email: hinkle@noao.edu
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Abstract

LMC clusters offer an outstanding opportunity to investigate the late stages of stellar evolution of stars in the mass range between 1.5 and 2 M. In this presentation we will focus on our results on mixing events during the evolution along the Asymptotic Giant Branch (AGB). Surface abundances have been determined for a number of cluster AGB stars from high resolution near infrared spectra. We show for the first time the evolution of C/O and 12C/13C ratios along a cluster AGB. The change of both quantities due to dredge up events is compared with model predictions. Our results indicate the late occurrence of a moderate extra-mixing in some cases.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2009

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