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A high-mass-ratio red-dwarf contact binary with an extremely cool close-in red dwarf
Fang XH(方小慧)1,2,3,4; Qian SB(钱声帮)1,2,3,4; Zejda, Miloslav5; Boonrucksar, Soonthornthum6; Zhou X(周肖)1,2,3,4,6; Zhu LY(朱俐颖)1,2,3,4; Liao WP(廖文萍)1,2,4
发表期刊PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
2019-12-01
卷号71期号:6页码:10
DOI10.1093/pasj/psz113
产权排序第1完成单位
收录类别SCI ; EI
关键词binaries: close binaries: eclipsing stars: evolution stars: individual (1SWASP J161335.80-284722.2)
摘要

1SWASP J161335.80-284722.2 (hereafter J161335) is an eclipsing red -dwarf binary with an orbital period of 0.229778 d, which is around the short-period limit for contact binaries. Three sets of multi -color light curves of J161335 were obtained from different telescopes in 2015 and 2016 and are analyzed using the Wilson-Devinney method. We discovered that the system is a W-type contact system with a contact degree of 19% and a high mass ratio of 0.91. By using all available eclipse times, we found that the observed - calculated (0 - C) diagram displays a cyclic oscillation with an amplitude of 0.00196(+/- 0.00006) d and a period of 4.79(+/- 0.14) yr while it undergoes a downward parabolic change. This downward variation corresponds to a continuous decrease in the orbital period at a rate of dP/dt= -4.26( 0.01) x 10(-7) d yr(-1). The small -amplitude oscillation is explained as the light travel -time effect from the gravitational influence of a third body with a lowest mass of M-3 = 0.15(+/- 0.01)M-circle dot. In solving the light curves, we found that the third light is increasing, with the wavelength suggesting that the third body may be a cool red dwarf. This is in agreement with the results obtained by analyzing the O - C diagram. The tertiary red dwarf is orbiting the central red -dwarf binary at an orbital separation of 2.8(+/- 0.2) au. These results suggest that the J161335 system may be formed through early dynamical interaction where the original low-mass component was replaced by a higher-mass third body and the lower-mass component was kicked out to a wider orbit.

资助项目National Natural Science Foundation of China[11573063] ; National Natural Science Foundation of China[11611530685] ; Key Science Foundation of Yunnan Province[2017FA001]
项目资助者National Natural Science Foundation of China[11573063, 11611530685] ; Key Science Foundation of Yunnan Province[2017FA001]
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::天文学
文章类型Article
出版者OXFORD UNIV PRESS
出版地GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0004-6264
URL查看原文
WOS记录号WOS:000509666400019
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]STAR LIGHT ; ECLIPSING BINARY ; SYSTEMS
EI入藏号20215211379313
EI主题词Travel time
EI分类号431 Air Transportation - 432 Highway Transportation - 433 Railroad Transportation - 434 Waterway Transportation - 657.2 Extraterrestrial Physics and Stellar Phenomena - 931.5 Gravitation, Relativity and String Theory
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/114a53/22418
专题双星与变星研究组
中国科学院天体结构与演化重点实验室
通讯作者Fang XH(方小慧)
作者单位1.Yunnan Observatories, Chinese Academy of Sciences (CAS), P.O. Box 110, 650216 Kunming, China
2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P.O. Box 110, 650216 Kunming, China
3.University of Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, 100049 Beijing, China
4.Center for Astronomical Mega-Science, Chinese Academy of Science, 20A Datun Road, Chaoyang Distric, Beijing, 100012, P.R. China
5.Department of Theoretical Physics and Astrophysics, Masaryk University, Kotlarska 2, CZ-611 37 Brno, Czech Republic
6.National Astronomical Research Institute of Thailand, 191 Siriphanich Bldg., Huay Kaew Rd., Chiang Mai 50200, Thailand
第一作者单位中国科学院云南天文台
通讯作者单位中国科学院云南天文台
推荐引用方式
GB/T 7714
Fang XH,Qian SB,Zejda, Miloslav,et al. A high-mass-ratio red-dwarf contact binary with an extremely cool close-in red dwarf[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2019,71(6):10.
APA Fang XH.,Qian SB.,Zejda, Miloslav.,Boonrucksar, Soonthornthum.,Zhou X.,...&Liao WP.(2019).A high-mass-ratio red-dwarf contact binary with an extremely cool close-in red dwarf.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,71(6),10.
MLA Fang XH,et al."A high-mass-ratio red-dwarf contact binary with an extremely cool close-in red dwarf".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 71.6(2019):10.
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