Rotating models for evolved low-mass stars

Details Rotating models for evolved low-mass stars Rotating models for evolved low-mass stars

2003-04-29

arxiv.org/abs/astro-ph/0304518v1

Astronomy and Astrophysics

Astrophysics

Review paper presented at the IAU Symposium 215 on Stellar Rotation (Cancun 2002)

Scientific paper

Low mass stars (< 2-2.5 M_sun) 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.

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