Age determination of galactic B-type stars in double-lined eclipsing binaries

TL;DR

This study determines the ages of galactic B-type main sequence stars in double-lined eclipsing binaries using evolutionary models, finding ages from 2.5 to 200 million years and adjusting metallicity and overshooting parameters for consistency.

Contribution

It provides a method to accurately determine stellar ages in binary systems by combining radius-age diagrams and HR diagram positions, adjusting metallicity and overshooting parameters.

Findings

33 out of 38 binaries have consistent age determinations.

Age range of B-type stars from 2.5 to 200 million years.

Range of metallicity and overshooting parameters for consistent solutions.

Abstract

We present the results of age determination for galactic B-type main sequence stars which are components of double-lined eclipsing binaries. Only detached systems are considered. We analyze 38 binary systems that meet such criteria. The analysis is based on evolutionary computations and we consider that the age is determined if there is a common value from the radius-age diagrams and the agreement in the position of both components in the Hertzsprung-Russel diagram. In some cases, to meet these two conditions, it was necessary to adjust the value of the metallicity, Z or/and the parameter of overshooting from the convective core, $\alpha_{ov}$. We determine the consistent age for 33 binaries out of 38. Besides, we made an extensive computations and for each system we give the range of $\alpha_{ov}$ and Z, for which the consistent solutions exist. The age of the studied B-type main sequence stars ranges, as counted from the Zero Age Main Sequence, from about 2.5 Myr to about 200 Myr.