First R and I Lights and Their Photometric Analyses of GSC 02393-00680

TL;DR

This study presents photometric analysis of GSC 02393-00680, revealing it as a shallow contact binary with a high mass ratio, and suggests the presence of a third body causing period oscillations.

Contribution

First detailed R and I light curves and analysis of GSC 02393-00680, identifying it as a high mass ratio shallow contact binary with potential third body influence.

Findings

GSC 02393-00680 is a W-type shallow contact binary.

The system has a high mass ratio of 1.600.

Period oscillation suggests a possible third body.

Abstract

We obtained complete $R$ and $I$ light curves of GSC 02393-00680 in 2008 and analyzed them with the 2003 version of the W-D code. It is shown that GSC 02393-00680 is a W-type shallow contact binary system with a high mass ratio $q=1.600$ and a degree of contact factor $f=5.0%(\pm1.3%)$. It will be a good example to check up on the TRO theory. A period investigation based on all available data suggests that the system has a small-amplitude period oscillation ($A_3=0.^{d}0030$; $T_3=1.92$years). This may indicate it has a moderate mass close third body, which is similar to XY Leo.