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

• Published in: Research in astronomy and astrophysics Vol. 21; no. 5; pp. 122 - 202
• Main Authors: Li, Yu-Yang, Li, Kai, Liu, Yuan
• Format: Journal Article
• Language: English
• Published: Beijing National Astronomical Observatories, CAS and IOP Publishing Ltd 01.06.2021; IOP Publishing; Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment,Institute of Space Sciences,Shandong University,Weihai 264209,China%Qilu Institute of Technology,Jinan 250200,China
• Subjects: Angular momentum; Binary stars; Light curve; Orbits; Photometry; stars: binaries: close; stars: binaries: eclipsing; stars: individual (V0842 Cep); Stellar winds; stars:binaries:eclipsing; stars:individual (V0842 Cep); stars:binaries:close
• ISSN: 1674-4527
• DOI: 10.1088/1674-4527/21/5/122

V0842 Cep is a W UMa-type binary star that has been neglected since its discovery. We analysed the VR c I c light curves, obtained by the 1 m telescope at 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 ( d p d t = 1.50(±0.42)×10 −7 d yr −1 ). This trend could be attributed to the angular momentum loss via stellar wind.