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Li abundance evolution as probe of extra-mixing in 47 Tuc RGB stars

Published online by Cambridge University Press:  23 December 2005

A. Lèbre ,
A. Palacios ,
G. Jasniewicz ,
P. De Laverny ,
C. Charbonnel ,
A. Recio-Blanco  and
F. Thévenin
A. Lèbre
Affiliation:
GRAAL CC 72- Université Montpellier II – 34095 Montpellier Cx 05, France email: [email protected]
A. Palacios
Affiliation:
IAA – Université Libre de Bruxelles – Bd du Triomphe CP-226 – 1050, Bruxelles, Belgium
G. Jasniewicz
Affiliation:
GRAAL CC 72- Université Montpellier II – 34095 Montpellier Cx 05, France email: [email protected]
P. De Laverny
Affiliation:
Dept Cassiopée – Observatoire de la Côte d'Azur – BP 4229 – 06304, Nice Cx 4, France
C. Charbonnel
Affiliation:
LA2T – Observatoire Midi-Pyrénées – 14 av. E. Belin – 31400 Toulouse, France Geneva Observatory – 51 Ch. Des Maillettes – 1280 Sauverny, Switzerland
A. Recio-Blanco
Affiliation:
Dept Cassiopée – Observatoire de la Côte d'Azur – BP 4229 – 06304, Nice Cx 4, France
F. Thévenin
Affiliation:
Dept Cassiopée – Observatoire de la Côte d'Azur – BP 4229 – 06304, Nice Cx 4, France
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Abstract

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Fundamental parameters and lithium abundances, ALi, have been derived for a sample of evolved stars in the globular cluster 47 Tuc (from GIRAFFE spectra and MARCS models of atmosphere). These data sample a complete evolutionary sequence from subgiant stage to the tip of the Asymptotic Giant Branch. With this unique observational data set we have analyzed the evolution of ALi along the Red Giant Branch (RGB) using non-standard stellar evolution models, so as to explore the occurence and the efficiency of extra-mixing processes in low mass stars at the so-called Red Giant bump.

Keywords

Stars: abundancesstars: evolutionstars: interiorsstars: rotation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Symposium S228: From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution , May 2005 , pp. 399 - 400
Copyright
© 2005 International Astronomical Union