Evolutionary tracks and isochrones for low- and intermediate-mass stars: From 0.15 to 7 $M_{\odot}$, and from $Z=0.0004$ to 0.03

TLDR

We present a large grid of stellar evolutionary tracks suitable for modelling star clusters and galaxies by means of population synthesis. The authors compute a comprehensive grid of tracks for masses 0.15–7 M⊙ and metallicities Z = 0.0004–0.03, using updated opacities, EOS, and moderate convective overshoot, covering evolution from ZAMS to TP‑AGB or carbon ignition, and also provide solar‑composition models with the Schwarzschild criterion, from which they derive Johnson‑Cousins UBVRIJHK isochrones.

Abstract

We present a large grid of stellar evolutionary tracks, which are suitable to modelling star clusters and galaxies by means of population synthesis. The tracks are presented for the initial chemical compositions , , , , (solar composition), and . They are computed with updated opacities and equation of state, and a moderate amount of convective overshoot. The range of initial masses goes from to , and the evolutionary phases extend from the zero age main sequence (ZAMS) till either the thermally pulsing AGB regime or carbon ignition. We also present an additional set of models with solar composition, computed using the classical Schwarzschild criterion for convective boundaries. From all these tracks, we derive the theoretical isochrones in the Johnson-Cousins UBVRIJHK broad-band photometric system.