Photometric Studies of Twelve Deep, Low-mass Ratio Overcontact Binary Systems

Author(s):  
Shengbang Qian ◽  
Yuangui Yang ◽  
Liying Zhu ◽  
Jiajia He ◽  
Jingzhao Yuan
2006 ◽  
Vol 131 (6) ◽  
pp. 3028-3039 ◽  
Author(s):  
S.-B. Qian ◽  
L. Liu ◽  
B. Soonthornthum ◽  
L.-Y. Zhu ◽  
J.-J. He

2013 ◽  
Vol 146 (2) ◽  
pp. 35 ◽  
Author(s):  
Y.-G. Yang ◽  
S.-B. Qian ◽  
L.-Y. Zhang ◽  
H.-F. Dai ◽  
B. Soonthornthum

2006 ◽  
Vol 304 (1-4) ◽  
pp. 25-28 ◽  
Author(s):  
Qian Shengbang ◽  
Yang Yuangui ◽  
Zhu Liying ◽  
He Jiajia ◽  
Yuan Jingzhao

2007 ◽  
Vol 134 (4) ◽  
pp. 1475-1482 ◽  
Author(s):  
S.-B. Qian ◽  
L. Liu ◽  
B. Soonthornthum ◽  
L.-Y. Zhu ◽  
J.-J. He

2005 ◽  
Vol 130 (3) ◽  
pp. 1206-1211 ◽  
Author(s):  
S.-B. Qian ◽  
L.-Y. Zhu ◽  
B. Soonthornthum ◽  
J.-Z. Yuan ◽  
Y.-G. Yang ◽  
...  

2020 ◽  
Vol 497 (3) ◽  
pp. 3381-3392
Author(s):  
Di-Fu Guo ◽  
Kai Li ◽  
Xing Gao ◽  
Dong-Yang Gao ◽  
Zhi-Jian Xu ◽  
...  

ABSTRACT By analysing the data observed by the Comet Search Programme telescope at Xingming Observatory from 2018 October 11 to 2018 December 19, 24 eclipsing binaries were identified. By cross-matching with the VSX (AAVSO) website, we found that four binaries are newly discovered. By analysing the Transiting Exoplanet Survey Satellite (TESS) data, the light curves of 17 binaries were obtained. First photometric solutions of 23 binaries were obtained by simultaneously analysing all the light curves, except for NSVS 1908107 (first analysed by Pan et al.). Based on the photometric solutions, nine binaries belong to detached binary systems, ten binaries belong to semidetached binary systems, and five binaries belong to contact binary systems. Two W-subtype low-mass ratio contact binaries (the less massive components are hotter), with total eclipsing light curves, were identified: Mis V1395 is a deep contact binary (q = 0.150, $f=80{{\ \rm per\ cent}}$), while NSVS 1917038 is a low-mass ratio binary with an unexpectedly marginal contact degree (q = 1/6.839 = 0.146, $f=4{{\ \rm per\ cent}}$). The total eclipsing detached binary GSC 03698-00022 has an extremely low mass ratio of q = 0.085. The Algol-type binary NSVS 1908107 is also found to have an extremely low mass ratio of q = 0.081. The Algol-type binary DK Per exhibits a continuous period decrease at a rate of dP/dt = −1.26 × 10−7 d yr−1, which may result from the orbital angular momentum loss. Based on the light curves obtained from the TESS data, a pulsating binary candidate (NSVS 1913053) was found.


2005 ◽  
Vol 130 (1) ◽  
pp. 224-233 ◽  
Author(s):  
S.-B. Qian ◽  
Y.-G. Yang ◽  
B. Soonthornthum ◽  
L.-Y. Zhu ◽  
J.-J. He ◽  
...  

2011 ◽  
Vol 142 (4) ◽  
pp. 124 ◽  
Author(s):  
L. Y. Zhu ◽  
S. B. Qian ◽  
B. Soonthornthum ◽  
J. J. He ◽  
L. Liu

2019 ◽  
Vol 14 (S351) ◽  
pp. 228-232
Author(s):  
Weijia Sun ◽  
Chengyuan Li ◽  
Licai Deng ◽  
Richard de Grijs

AbstractWe present a detailed analysis of the projected stellar rotational velocities of the well-separated double main sequence (MS) in the young, ∼200 Myr-old Milky Way open cluster NGC 2287 and suggest that stellar rotation may drive the split MSs in NGC 2287. We find that the observed distribution of projected stellar rotation velocities could result from a dichotomous distribution of stellar rotation rates. We discuss whether our observations may reflect the effects of tidal locking affecting a fraction of the cluster’s member stars in stellar binary systems. The slow rotators are likely stars that initially rotated rapidly but subsequently slowed down through tidal locking induced by low-mass-ratio binary systems. However, the cluster may have a much larger population of short-period binaries than is usually seen in the literature, with relatively low secondary masses.


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