Astron. Astrophys. Suppl. Ser. 144, 487-499
Age-luminosity relations for low-mass metal-poor stars
A. Weiss - H. Schlattl
Send offprint request: A. Weiss;
Max-Planck-Institut für Astrophysik,
Karl-Schwarzschild-Str. 1, 85748 Garching,
Received October 15, 1999; accepted April 12, 2000
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
Key words: stars: evolution -- stars: interior -- stars: Population II
Copyright The European Southern Observatory (ESO)
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