Evolution models for α-enhanced stars (Salasnich+ 2000)

Details Evolution models for α-enhanced stars (Salasnich+ 2000) Evolution models for α-enhanced stars (Salasnich+ 2000)

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ycat..33611023s&link_type=abstract

VizieR On-line Data Catalog: J/A+A/361/1023. Originally published in: 2000A&A...361.1023S

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Models: Evolutionary, Photometry: Ubvrijklmnh, Abundances, Effective Temperatures

Scientific paper

We present four large sets of evolutionary tracks for stars with initial chemical compositions [Y=0.250, Z=0.008], [Y=0.2773, Z=0.019], [Y=0.320, Z=0.040] and [Y=0.390, Z=0.070] and enhancement of α 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 [Y, Z] 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 1M&sun; Finally, the major changes in the tracks, isochrones, and integrated magnitudes and colours passing from solar-scaled to α-enhanced mixtures are briefly outlined. Retrieval of the complete data set is possible via the www page http://pleiadi.pd.astro.it . (8 data files).

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