CoRoT/ESTA-TASK 1 and TASK 3 comparison of the internal structure and seismic properties of representative stellar models: Comparisons between the ASTEC, CESAM, CLES, GARSTEC and STAROX codes

TL;DR

This study compares stellar models from five different codes to assess their consistency in predicting internal structures and seismic properties, aiding the interpretation of CoRoT asteroseismology data.

Contribution

It provides a detailed comparison of stellar evolution codes, highlighting their differences and the reasons behind them, to improve modeling accuracy for CoRoT targets.

Findings

Overall good agreement between codes

Discrepancies mainly due to EOS, opacities, convective boundaries

Results will assist in interpreting CoRoT asteroseismology data

Abstract

We compare stellar models produced by different stellar evolution codes for the CoRoT/ESTA project, comparing their global quantities, their physical structure, and their oscillation properties. We discuss the differences between models and identify the underlying reasons for these differences. The stellar models are representative of potential CoRoT targets. Overall we find very good agreement between the five different codes, but with some significant deviations. We find noticeable discrepancies (though still at the per cent level) that result from the handling of the equation of state, of the opacities and of the convective boundaries. The results of our work will be helpful in interpreting future asteroseismology results from CoRoT.