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发表刊物：
MNRAS
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关键字：
binaries : close – binaries : eclipsing – stars: evolution – stars: individual : TYC 4002-2628-1
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摘要：
Photometric observations for the totally eclipsing binary system TYC 4002-2628-1, were obtained between November 2020
and November 2021. To determine the stellar atmospheric parameters, a spectral image was taken with the 2.16 m telescope
at National Astronomical Observatory of China (NAOC). TYC 4002-2628-1 is a low-amplitude (about 0.15 mag for V band)
short-period (0.3670495 d) contact eclipsing binary with a total secondary eclipse. Intrinsic light curve variations and the reversal
of the O’Connell effect are detected in the light curves, which may be due to spot activity. Based on the photometric solutions
derived from the multiband time series light curves, TYC 4002-2628-1 is an extremely low-mass ratio contact binary with a
mass ratio of q ∼ 0.0482 and a fill-out factor of f ∼ 5 per cent. By analysing the O − C variations, we find that its orbital
period remains unchanged when BJD < 2458321. Then the orbital period changed suddenly around BJD 2458743 and has
an increasing rate of dP /dt = 1.62 × 10−5 d · yr−1 = 140 s · century−1. If confirmed, TYC 4002-2628-1 would be the contact
binary with the highest orbital period increasing rate so far. By investigating the ratio of orbital angular momentum to the spin
angular momentum (Jorb/Jspin < 3), the instability mass ratio (qinst/q = 1.84) and the instability separation (Ainst/A = 1.35),
TYC 4002-2628-1 can be regarded as a merger candidate.
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第一作者：
Di-Fu. Guo ,Kai Li , Fen Liu, Huai-Zhen Li, Qi-Qi Xia,Xing Gao, Xiang Gao, Xu Chen, Dong-Yang Gao, and Guo-You Sun
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论文类型：
期刊论文
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学科门类：
理学
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一级学科：
物理学
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是否译文：
否
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发表时间：
2022-10-01
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收录刊物：
SCI
