Age-luminosity relations for low-mass metal-poor stars

Details Age-luminosity relations for low-mass metal-poor stars Age-luminosity relations for low-mass metal-poor stars

1999-12-15

arxiv.org/abs/astro-ph/9912310v2

Astronomy and Astrophysics

Astrophysics

accepted for publication by Astron. Astrophys. Suppl. Series; Appendix (tables) included

Scientific paper

10.1051/aas:2000223

We present a grid of evolutionary calculations for metal-poor low-mass stars for a variety of initial helium and metal abundances. The intention is mainly to provide a database for deriving directly stellar ages of halo and globular cluster stars for which basic stellar parameters are known, but the tracks can also be used for isochrone or luminosity function construction, since they extend to the tip of the red giant branch. Fitting formulae for age-luminosity relations are provided as well. The uncertainties of the evolutionary ages due to inherent shortcomings in the models and due to the unclear effectiveness of diffusion are discussed. A first application to field single stars is presented.

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