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LL Com: A Near-contact Total Eclipsing Binary at a Key Stage of Evolution
Hu, Ke1; Chen, Kun1; Xiang, Fu-Yuan1; Yu, Yun-Xia1; Zhao EG(赵二刚)2
发表期刊ASTRONOMICAL JOURNAL
2019-09-01
卷号158期号:3页码:9
DOI10.3847/1538-3881/ab322c
产权排序第2完成单位
收录类别SCI
关键词binaries: close binaries: eclipsing stars: evolution stars: individual (LL Com)
摘要Despite the discovery of LL Com, a Lyrae-type eclipsing binary system, approximately 60 yr ago, little has been found concerning its detailed photometry and orbital-period change until now. In this paper, we present the first multi-band charge-coupled-device photometric light curves, from which a significant luminosity reduction around the primary eclipse is revealed. Based on LAMOST data, we first determined LL Com's spectrum as F1V and then analyzed the light curves with the 2015 version of the Wilson-Devinney code. The fact that LL Com is a nearcontact binary system with a semi-detached configuration, where the secondary component only fills its Roche lobe and the primary component fills more than 95% of its Roche lobe, is suggested through the photometric solution. In addition, according to archival photometry and previously published times of minima, a secular period increase at a rate of (P) over dot = 2.62 x 10(-7) day yr(-1) was found, which implies a continuous mass transfer from the secondary to the primary. Utilizing the photometric solution and the simulations of single-particle trajectories, we propose the existence of a cool spot on the surface of the primary component. This cool spot can be naturally produced by the impacts that occur during mass flow, and it also successfully interprets the luminosity reduction in the light curves. Finally, with the combination of thermal relaxation oscillation theory and the Roche-Lobe model, we conclude that LL Com is transitioning from the semi-detached to the detached phase.
资助项目National Natural Science Foundation of China[U1731110] ; National Natural Science Foundation of China[U1731106] ; National Natural Science Foundation of China[11703020] ; Chinese Academy of Sciences[U1731110] ; Chinese Academy of Sciences[U1731106]
项目资助者National Natural Science Foundation of China[U1731110, U1731106, 11703020] ; Chinese Academy of Sciences[U1731110, U1731106]
语种英语
学科领域天文学 ; 恒星与银河系 ; 恒星形成与演化
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-6256
URL查看原文
WOS记录号WOS:000481535300001
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]HOT-SPOT ; SYSTEM ; LIGHT ; ANDROMEDAE ; LOCATION ; STARS
引用统计
被引频次:10[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/20860
专题双星与变星研究组
通讯作者Xiang, Fu-Yuan
作者单位1.Physics Department, University of Xiangtan, 411105 Xiangtan, Hunan Province, People's Republic of China
2.Yunnan Observatories, Chinese Academy of Sciences, 650216 Kunming, Yunnan Province, People's Republic of China
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GB/T 7714
Hu, Ke,Chen, Kun,Xiang, Fu-Yuan,et al. LL Com: A Near-contact Total Eclipsing Binary at a Key Stage of Evolution[J]. ASTRONOMICAL JOURNAL,2019,158(3):9.
APA Hu, Ke,Chen, Kun,Xiang, Fu-Yuan,Yu, Yun-Xia,&Zhao EG.(2019).LL Com: A Near-contact Total Eclipsing Binary at a Key Stage of Evolution.ASTRONOMICAL JOURNAL,158(3),9.
MLA Hu, Ke,et al."LL Com: A Near-contact Total Eclipsing Binary at a Key Stage of Evolution".ASTRONOMICAL JOURNAL 158.3(2019):9.
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