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Astron. Astrophys. 361, 1023-1035 (2000)

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Evolutionary tracks and isochrones for [FORMULA]-enhanced stars

B. Salasnich 1, L. Girardi 1,2, A. Weiss 2 and C. Chiosi 1

1 Department of Astronomy, University of Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy
2 Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, 85740 Garching bei München, Germany

Received 22 May 2000 / Accepted 14 July 2000


We present four large sets of evolutionary tracks for stars with initial chemical compositions [FORMULA], [FORMULA], [FORMULA] and [FORMULA] and enhancement of [FORMULA] elements with respect to the solar pattern. The major improvement with respect to previous similar calculations is that we use consistent opacities - i.e. computed with the same chemical composition as adopted in the stellar models - over the whole relevant range of temperatures. For the same initial chemical compositions [FORMULA] and otherwise identical input physics we present also new evolutionary sequences with solar-scaled mixtures of abundances. Based on these stellar models we calculate the corresponding sets of isochrones both in the Johnson-Cousins UBVRIJHK and HST/WFPC2 photometric systems. Furthermore, we derive integrated magnitudes, colours and mass-to-light ratios for ideal single stellar populations with total mass equal to [FORMULA]. Finally, the major changes in the tracks, isochrones, and integrated magnitudes and colours passing from solar-scaled to [FORMULA]-enhanced mixtures are briefly outlined. Retrieval of the complete data set is possible via the www page http://pleiadi.pd.astro.it .

Key words: stars: evolution – stars: interiors – stars: Hertzsprung – Russel (HR) and C-M diagrams

Send offprint requests to: L. Girardi (lgirardi@pd.astro.it)

This article contains no SIMBAD objects.


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© European Southern Observatory (ESO) 2000

Online publication: October 10, 2000