Evolutionary tracks and isochrones for alpha-enhanced stars

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dc.creatorSalasnich, Bernardo
dc.creatorGirardi, Leo
dc.creatorWeiss, Achim
dc.creatorChiosi, Cesare
dc.date2000-07-26
dc.date.accessioned2026-07-07T01:54:32Z
dc.date.available2026-07-07T01:54:32Z
dc.descriptionWe present four large sets of evolutionary tracks for stars with initial chemical compositions [Y=0.250, Z=0.008], [Y=0.273, Z=0.019], [Y=0.320, Z=0.040] and [Y=0.390, Z=0.070] and enhancement of alpha 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 1 Msun. Finally, the major changes in the tracks, isochrones, and integrated magnitudes and colours passing from solar-scaled to alpha-enhanced mixtures are briefly outlined. Retrieval of the complete data set is possible via http://pleiadi.pd.astro.it .
dc.description14 pages, 10 figures, A&A in press
dc.identifierhttps://arxiv.org/abs/astro-ph/0007388
dc.identifierhttp://arxiv.org/abs/astro-ph/0007388
dc.identifierA&A 361, 1023 (2000).
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/1390
dc.subjectAstrophysics
dc.titleEvolutionary tracks and isochrones for alpha-enhanced stars
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