A large project for the computation of stellar tracks and isochrones covering an extended region of the Z-Y plane has been undertaken to allow people to model stellar populations for different helium enrichment values. TP-AGB computations are included with variable molecular opacities adopting low-temperature opacities properly evaluated for the chemical mixtures of evolving TP-AGB models, instead of usual scaled-solar ones. We evaluate the effects of a significant helium enhancement on bolometric corrections and T_{eff}-colour relations.
Isochrones for an Extended Region of the Z-Y Plane Including New Asymptotic Giant Branch Models
MARIGO, PAOLA;
2007
Abstract
A large project for the computation of stellar tracks and isochrones covering an extended region of the Z-Y plane has been undertaken to allow people to model stellar populations for different helium enrichment values. TP-AGB computations are included with variable molecular opacities adopting low-temperature opacities properly evaluated for the chemical mixtures of evolving TP-AGB models, instead of usual scaled-solar ones. We evaluate the effects of a significant helium enhancement on bolometric corrections and T_{eff}-colour relations.
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