Absolute properties of BG Ind - a bright F3 system just leaving the Main Sequence

TL;DR

This study provides detailed photometric and spectroscopic analysis of BG Ind, a bright eclipsing binary, revealing its fundamental properties and evolutionary status, and offers insights into stellar overshooting models for stars around 1.2-1.5 solar masses.

Contribution

It presents precise measurements of BG Ind's stellar parameters and discusses its evolutionary stage, contributing to testing stellar overshooting theories in the critical mass range.

Findings

Masses: 1.428 and 1.293 Msun

Age: 2.65 Gyr, primary near TAMS

Metallicity: [Fe/H] = -0.2

Abstract

We present photometric and spectroscopic analysis of the bright detached eclipsing binary BG Ind. The masses of the components are found to be 1.428 +- 0.008 and 1.293 +- 0.008 Msun and the radii to be 2.290+-0.017 and 1.680+-0.038 Rsun for primary and secondary stars, respectively. Spectra- and isochrone-fitting coupled with color indices calibration yield [Fe/H]=-0.2+-0.1. At an age of 2.65+-0.20 Gyr BG Ind is well advanced in the main-sequence evolutionary phase - in fact, its primary is at TAMS or just beyond it. Together with three similar systems (BK Peg, BW Aqr and GX Gem) it offers an interesting opportunity to test the theoretical description of overshooting in the critical mass range 1.2-1.5 Msun.