A photometric study of V608 Cam: apparent period changes as a result of surface activity

TL;DR

This study analyzes V608 Cam's light curves to understand its surface activity and period variations, revealing a detached binary with surface activity influencing apparent period changes over a 2.4-year cycle.

Contribution

It provides detailed photometric analysis and surface activity characterization of V608 Cam, linking period changes to surface activity cycles.

Findings

Detached binary configuration identified

Surface activity causes apparent period variations

Surface activity cycle lasts approximately 2.4 years

Abstract

The VRI light curves were measured for the low-mass eclipsing binary V608 Cam as a part of our long-term observational project for studying of eclipsing binaries with a short orbital period. The Tess light curve solution in Phoebe results to the detached configuration, where the temperature of primary component was fixed to $T_1 = 5300$ K according to Gaia results, which gives us $T_2 = 4110 \pm 50$ K for the secondary. The spectral type of the primary component was derived to be K0 and the photometric mass ratio was estimated $q = 0.92 \pm 0.07$. Characteristics and temporal variation of the cold region on the surface of the secondary component were estimated and are attributed to apparent period changes of this eclipsing binary with a cycle of about 2.4 yr.