ROTSE1 J164341.65+251748.1: a new W UMa-type eclipsing binary

TL;DR

This paper reports the discovery and detailed analysis of a new W UMa-type eclipsing binary star, ROTSE1 J164341.65+251748.1, including its physical properties and variable features.

Contribution

It provides the first detailed photometric analysis and physical characterization of a newly identified W UMa-type binary star.

Findings

Orbital period of ~0.323 days

Mass ratio of ~0.34

Presence of variable bright spots on the primary star

Abstract

ROTSE1 J164341.65+251748.1 was photometrically observed in the V band during three epochs with the 0.84-m telescope of the San Pedro M\'artir Observatory in Mexico. Based on additional BVR photometry, we find that the primary star has a spectral type around G0V. The light curve of the system is typical of a W~UMa type binary stars and has an orbital period of $\sim$ 0.323 days. In an effort to gain a better understanding of the binary system and determine its physical properties, we analyzed the light curve with the Wilson and Devinney method. We found that ROTSE1 J164341.65+251748.1 has a mass ratio of $\sim$ 0.34 and that the less massive component is over 230 K hotter than the primary star. The inclination of the system is $\sim$ 84.6 degrees, and the {\bf degree} of over-contact is 11\%. The analysis shows the presence of variable bright spots on the primary star.