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

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 $f=5.0$. 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.

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• Absolute Magnitude Calibration for the W UMa-type Systems Based on Hipparcos Data
• Contact binaries with additional components. III. The adaptive optics detections
• CCD photometric study of the W UMa-type binary II CMa in the field of Berkeley 33