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The effect of rotation on RGB surface abundances

Published online by Cambridge University Press:  25 May 2016

C. Charbonnel
C. Charbonnel*
Affiliation:
Laboratoire d'Astrophysique de Toulouse - CNRS UMR 5772 −14, av. E. Belin, 31400 Toulouse, France

Extract

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Pop II field and globular cluster giant stars (and, to a less extent, Pop I giants) exhibit chemical anomalies which are not predicted by standard stellar evolution theory. Two hypotheses have been proposed to explain these abundance variations, namely the primordial and the evolutionary explanations. A primordial origin for intracluster abundance anomalies (see e.g. Cottrel & Da Costa 1981) would be related to inhomogeneities in the cluster material due to pollution by a prior generation of massive stars. In the evolutionary hypothesis, abundance variations would be due to nuclear and mixing processes internal to the giant stars themselves. Many good reviews exist on the subject (see e.g. Briley et al. 1994a, Kraft 1994), in which observational evidence supporting both hypotheses are presented. In this conference, Da Costa recalls the most recent observational data, and some excellent poster contributions bring essential clues to the subject.

Type
Stellar Interiors
Information
Symposium - International Astronomical Union , Volume 189: Fundamental Stellar Properties: The Interaction Between Observation and Theory , 1997 , pp. 349 - 354
Copyright
Copyright © Kluwer 1997 

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