GSC 4560--02157: a New Long-period Eclipsing Cataclysmic Variable Star

TL;DR

This paper reports the discovery and analysis of a new short-period eclipsing cataclysmic variable star, GSC 4560--02157, including its photometric and spectroscopic characteristics, confirming its cataclysmic nature.

Contribution

It presents the first detailed photometric and spectroscopic study of GSC 4560--02157, establishing it as a new long-period eclipsing cataclysmic variable star.

Findings

Identified GSC 4560--02157 as a short-period eclipsing cataclysmic variable.

Observed significant variability in out-of-eclipse brightness and secondary minima.

Detected emission lines indicating a cataclysmic variable star spectrum.

Abstract

We study the newly discovered variable star GSC 4560--02157. CCD photometry was performed in 2013--2014, and a spectrum was obtained with the 6-m telescope in June, 2014. GSC 4560--02157 is demonstrated to be a short-period (P=0.265359d) eclipsing variable star. All its flat-bottom primary minima are approximately at the same brightness level, while the star's out-of-eclipse brightness and brightness at secondary minimum varies considerably (by up to 0.6m) from cycle to cycle. Besides, there are short-term (time scale of 0.03-0.04 days) small-amplitude brightness variations out of eclipse. This behavior suggests cataclysmic nature of the star, confirmed with a spectrum taken on June 5, 2014. The spectrum shows numerous emissions of the hydrogen Balmer series, HeI, HeII.