Status Report

The Photometric Investigation of V921 Her using the Lunar-based Ultraviolet Telescope of Chang’e-3 mission

By SpaceRef Editor
August 4, 2016
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Xiao Zhou, Sheng-Bang Qian, Jia Zhang, Lin-Jia Li, Qi-Shan Wang
(Submitted on 1 Aug 2016)

The light curve of V921 Her in ultraviolet band observed by the Lunar-based Ultraviolet Telescope (LUT) is analyzed by the Wilson-Devinney code. Our solutions conclude that V921 Her is an early type marginal contact binary system with an additional close-in component. The binary system is under poor thermal contact with a temperature difference of nearly 700K between the two components. The close-in component contributes about 19% of the total luminosity in the triple system. Combining the radial velocity study together with our photometric solutions, the mass of the primary star and secondary one are calculated to be M1=1.784(±0.055)M?, M2=0.403(±0.012)M?. The evolutionary scenario of V921 Her is discussed. All times of light minimum of V921 Her available in the bibliography are taken into account and the O−C curve is analyzed for the first time. The most probable fitting results are discussed in the paper, which also confirm the existence of a third component (P3=10.2 year) around the binary system. The period of V921 Her is also undergoing a continuously rapid increase at a rate of dP/dt=+2.79×10−7day⋅year−1, which may due to mass transfer from the less massive component to the more massive one.
Subjects: Solar and Stellar Astrophysics (astro-ph.SR)

Journal reference: 2016,AdAst,2016E,7Z
DOI: 10.1155/2016/7468976
Cite as: arXiv:1608.00398 [astro-ph.SR] (or arXiv:1608.00398v1 [astro-ph.SR] for this version)
Submission history
From: Xiao Zhou
[v1] Mon, 1 Aug 2016 12:06:54 GMT (171kb)

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