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Rotating Models for Evolved Low-Mass Stars

Published online by Cambridge University Press:  26 May 2016

Corinne Charbonnel  and
Ana Palacios
Corinne Charbonnel
Affiliation:
LA-OMP (CNRS UMR 5572) 14, av.Belin, F-31400 Toulouse and Geneva Observatory, CH-1290 Sauverny
Ana Palacios
Affiliation:
LA-OMP (CNRS UMR 5572) 14, av.Belin, F-31400 Toulouse and IAA Université Libre de Bruxelles, Campus de la Plaine, Bd du Triomphe, B-1050 Bruxelles

Abstract

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Low mass stars (< 2-2.5 M⊙) exhibit, at all the stages of their evolution, signatures of processes that require challenging modeling beyond the standard stellar theory. In this paper we focus on their peculiarities while they climb the red giant branch (RGB). We first compare the classical predictions for abundance variations due to the first dredge-up with observational data in various environments. We show how clear spectroscopic diagnostics probe the nucleosynthesis and the internal mixing mechanisms that drive RGB stars. Coherent data reveal in particular the existence of a non-standard mixing process that changes their surface abundances at the so-called RGB bump. By reviewing the models presented so far to explain the various abundance anomalies, we show that the occurrence of this extra-mixing process is certainly related to rotation. Finally we discuss the so-called Li-flash which is expected to occur at the very beginning of the extra-mixing episode.

Type
Session 4 Rotation and Stellar Evolution
Information
Symposium - International Astronomical Union , Volume 215: Stellar Rotation , 2004 , pp. 440 - 449
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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