Multi-color light curves and orbital period research of eclipsing binary V1073 Cyg

• Published in: Research in astronomy and astrophysics Vol. 18; no. 2; pp. 83 - 92
• Main Authors: Tian, Xiao-Man, Zhu, Li-Ying, Qian, Sheng-Bang, Li, Lin-Jia, Jiang, Lin-Qiao
• Format: Journal Article
• Language: English
• Published: Beijing National Astronomical Observatories, CAS and IOP Publishing Ltd 01.02.2018; IOP Publishing
• Subjects: Color; Companion stars; Light curve; Orbits; Photometric observations; Photometry; stars: binaries: close; stars: binaries: eclipse; stars: binaries: individual (V1073 Cyg); Travel time; 二进制代码;曲线分析;多色光;轨道;电荷耦合器件;代码系统;光度计;UMa
• ISSN: 1674-4527; 2397-6209
• DOI: 10.1088/1674-4527/18/2/20

New multi-color BVRcIc photometric observations are presented for the W UMa type eclips- ing binary V1073 Cyg. The multi-color light curve analysis with the Wilson-Devinney procedure yielded the absolute parameters of this system, showing that V 1073 Cyg is a shallow contact binary system with a fill-out factor f = 0.124（±0.011）. We collected all available times of light minima spanning 119yr, including CCD data to construct the O - C curve, and performed detailed O - C analysis. The O - C diagram shows that the period change is complex. A long-term continuous decrease and a cyclic vari- ation exist. The period is decreasing at a rate ofP = -1.04（±0.18） × 10-10 d cycle-land, with the period decrease, V1073 Cyg will evolve to the deep contact stage. The cyclic variation with a period of P3 = 82.7（±3.6） yr and an amplitude of A = 0.028（±0.002） d may be explained by magnetic activ- ity of one or both components or the light travel time effect caused by a distant third companion with M3（i1 = 90°） = 0.511 M⊙.