Probing high-mass stellar evolutionary models with binary stars

TL;DR

This paper investigates massive binary stars V380 Cyg and Sigma Sco to measure core overshoot parameters and test the accuracy of current stellar evolution models, addressing the persistent mass discrepancy issue.

Contribution

It provides independent asteroseismic measurements of overshoot parameters, offering new constraints for stellar evolution models of massive stars.

Findings

Asteroseismic measurements of overshoot parameters obtained

Models show improved agreement with dynamical masses

Insights into core mixing processes in massive stars

Abstract

Mass discrepancy is one of the problems that is pending a solution in (massive) binary star research field. The problem is often solved by introducing an additional near core mixing into evolutionary models, which brings theoretical masses of individual stellar components into an agreement with the dynamical ones. In the present study, we perform a detailed analysis of two massive binary systems, V380 Cyg and Sigma Sco, to provide an independent, asteroseismic measurement of the overshoot parameter, and to test state-of-the-art stellar evolution models.