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Lithium abundance as a boundary condition for age and mass determination of solar twin stars

Published online by Cambridge University Press:  09 March 2010

M. Castro ,
J.-D. do Nascimento Jr. ,
J. S. da Costa ,
J. Meléndez ,
M. Bazot ,
S. Théado ,
G. F. Porto de Mello  and
J. R. De Medeiros
M. Castro
Affiliation:
DFTE - UFRN, Natal, Brazil
J.-D. do Nascimento Jr.
Affiliation:
DFTE - UFRN, Natal, Brazil
J. S. da Costa
Affiliation:
DFTE - UFRN, Natal, Brazil
J. Meléndez
Affiliation:
Centro de Astrofísica da Universidade do Porto, Porto, Portugal
M. Bazot
Affiliation:
Centro de Astrofísica da Universidade do Porto, Porto, Portugal
S. Théado
Affiliation:
Laboratoire d'Astrophysique de Toulouse-Tarbes - UPS, Toulouse, France
G. F. Porto de Mello
Affiliation:
Observatório do Valongo - UFRJ, Rio de Janeiro, Brazil
J. R. De Medeiros
Affiliation:
DFTE - UFRN, Natal, Brazil
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Abstract

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We explore the non-standard mixing history of five solar twins to determine as precisely as possible their mass and age. For this, we computed a grid of evolutionary models with non-standard mixing at given metallicities with the Toulouse-Geneva code for a range of stellar masses. We choose the evolutionary model that best fit the low lithium abundances observed in the solar twins. Our best model for each solar twin provides a mass and age solution constrained by their Li content and Teff determination. Li depletion due to the additional mixing in solar-twins is strongly mass dependent. An accurate lithium abundance measurement connected with non-standard models provides a more precise information about the age and mass better than that determined only by classical methods.

Keywords

stars: abundances(stars:) Hertzsprung-Russell diagramturbulence
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S265: Chemical Abundances in the Universe: Connecting First Stars to Planets , August 2009 , pp. 422 - 423
Copyright
Copyright © International Astronomical Union 2010

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