First photometric analysis and period investigation of the K-type W UMa type binary system V0842 Cep

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Yu-Yang Li, Kai Li, Yuan Liu

V0842 Cep is a W UMa-type binary star that has been neglected since its discovery. We analysed the VRcIc light curves, obtained by the 1 m telescope at the Weihai Observatory of Shandong University, using the Wilson-Devinney code. V0842 Cep was found to be a shallow contact binary system (f=8.7%) with a mass ratio of 2.281. Because its orbital inclination is greater than 80∘, the photometric results are reliable. A period study is included which reveals a continually decreasing orbital period (dpdt=1.50(±0.42)×10−7dyr−1). This trend could be attributed to the angular momentum loss via stellar wind.

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