New Multi-color BVRcIc photometric observation are presented for W UMa type eclipsing binary V1073 Cyg. The multi-color light curves analysis with the Wilson-Devinney(W-D) procedure acquired the absolute parameters of this system, showing that V1073Cyg is a shallow contact binary system with fill-out factor f=0.124(±0.011). We collected all available times of light minima spanning 119 years including CCD data to construct the O-C curve and made detailed O-C analysis. The O-C diagram shows that the period change is complex. There exist a long-term continuous decrease and a cyclic variation. The period is decreasing at a rate of P˙=−1.04(±0.18)×10−10days⋅cycle−1, and with the period decrease, V1073 Cyg will evolve to deep contact stage. The cyclic variation with a period of P3=82.7(±3.6)years and an amplitude of A=0.028(±0.002)day may be explained by the magnetic activity of one or both components or the light travel time effect (LTTE) caused by a distant third companion with M3(i′=90∘)=0.511M⊙.
@article{arxiv.1712.01072,
title = {Multi-color light curves and orbital period research of eclipsing binary V1073 Cyg},
author = {Xiao-man Tian and Li-ying Zhu and Sheng-bang Qian and Lin-jia Li and Lin-qiao Jiang},
journal= {arXiv preprint arXiv:1712.01072},
year = {2018}
}