Absolute Parameters of the Southern Detached Eclipsing Binary DG Mic

TL;DR

This study presents the first detailed analysis of the detached eclipsing binary DG Mic, deriving its fundamental parameters and evolutionary status through combined spectroscopic and photometric data.

Contribution

It provides the first spectroscopic and combined light curve analysis of DG Mic, determining its physical parameters and evolutionary stage.

Findings

Masses of primary and secondary are approximately 1.65 and 1.63 solar masses.

Radii of primary and secondary are approximately 1.64 and 1.91 solar radii.

Both stars are main-sequence and about 713 million years old.

Abstract

As part of an ongoing programme of observing detached eclipsing binary stars in the southern sky, we present the first analysis of spectroscopic observations of the Algol-type binary system DG Mic. A spectroscopic analysis of mid-resolution spectra allowed us to constrain the effective temperature of the primary component and to test the consistency of the system parameters with its spectral energy distribution (SED). Combined solutions of mid-resolution spectra and TESS, ASAS and WASP light curves imply a system of two almost identical components ($q$ = 0.99) in circular orbits. Our final model shows that the system is a detached binary star. The masses and radii of the primary and secondary components of DG Mic were derived to be 1.65($\pm$0.12) M$_\odot$, 1.64($\pm$0.18) M$_\odot$ and 1.63($\pm$0.10) R$_\odot$, 1.91($\pm$0.13) R$_\odot$, respectively. According to Geneva evolution models, both components of the system are main-sequence stars and their age is approximately 713 Myr.