Multicolour photometry of the M0V+M5V eclipsing binary V405 And

TL;DR

This study provides multicolour photometry and modeling of the active eclipsing binary V405 And, revealing the effects of stellar activity and component characteristics near the full convection threshold.

Contribution

It offers detailed photometric analysis and modeling of V405 And, highlighting the impact of spots and flares on light curves of stars near the full convection limit.

Findings

Components are just below and above the 0.3 solar mass convection threshold.

Light curves show significant spot activity and a small eclipse.

Stellar activity influences the observed light variations.

Abstract

We present multicolour photometry and modelling of the active eclipsing binary star V405 And. The components of 0.2 and 0.5 solar masses are just below and above the theoretical limit of the full convection, that is thought to be around 0.3 solar mass. The light curves are compositions of constant and variable features: the distorted shape of the components (about 25%), a small eclipse, and mainly of spots (about 75%) and flares.