Scaled solar tracks and isochrones in a large region of the Z-Y plane I. From the ZAMS to the TP-AGB end for 0.15 - 2.5 Mo stars

TL;DR

This paper provides a comprehensive set of stellar evolution tracks and isochrones for low-mass stars across a wide range of chemical compositions, extending models to the end of the AGB phase with new synthetic TP-AGB models.

Contribution

It introduces a large grid of scaled-solar stellar tracks and isochrones for 0.15-2.5 solar masses with updated physics and synthetic TP-AGB models, available through an interactive web interface.

Findings

Tracks and isochrones cover 0.15-2.5 Mo stars with 39 chemical compositions.

Models extend to the end of the thermal pulses along the AGB.

Tools for bidimensional interpolation of tracks have been developed.

Abstract

Tracks and isochrones have been computed in the range of initial masses 0.15 - 20 Mo for a grid of 39 chemical compositions with the metal content Z between 0.0001 and 0.070, and helium content Y between 0.23 and 0.46. The Padova stellar evolution code has been implemented with updated physics. New synthetic TP-AGB models allow the extension of stellar models and isochrones until the end of the thermal pulses along the AGB. Software tools for the bidimensional interpolation (in Y and Z) of the tracks have been tuned. This first paper presents tracks for low mass stars (from 0.15 to 2.5 Mo) with scaled-solar abundances and the corresponding isochrones from very old ages down to about 1 Gyr. Tracks and isochrones are made available in tabular form for the adopted grid of chemical compositions in the plane Z-Y. An interactive web interface will allow users to obtain isochrones of whatever chemical composition and also simulated stellar populations with different Y(Z) helium-to-metal enrichment laws.