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Two Massive Twins in a Deep-contact Binary with a Black Hole Candidate
Zhao EG(赵二刚)1,2,3; Qian SB(钱声帮)1,2,3,4; Soonthornthum, Boonrucksar5; Poshyachinda, Saran5; Zhou X(周肖)1,2,3,5; Sarotsakulchai, Thawicharat5; Zhang J(张嘉)1,2,3; Liao WP(廖文萍)1,2,3
Source PublicationASTROPHYSICAL JOURNAL LETTERS
2019-01-20
Volume871Issue:1Pages:6
DOI10.3847/2041-8213/aafc2e
Contribution Rank第1完成单位
Indexed BySCI
Keywordbinaries: close binaries: eclipsing stars: early-type stars: evolution stars: individual (V593 Cen)
Abstract

New light curves in B, V, R, and I bands for the B-type contact binary V593 Cen were obtained, and another V-band light curve was collected from All Sky Automated Survey data. We analyzed these two sets of light curves using the Wilson-Devinney code. It was found that V593 Cen is a deep-contact binary with a fill-out factor of more than 45%. The mass ratio, derived to be nearly one from light curves, indicates that this system contains two twin components. Together with the higher temperature of the less-massive component, it is inferred that the system has just passed the mass-reversal stage during the mass-transfer evolution. Therefore, at present it has the shortest period and deepest-contact configuration. By analyzing all available eclipse times, it is found that the O - C curve of V593 Cen shows a cyclic variation with a period of 50.9 yr. This can be explained as the light-travel time effect via the presence of a third body. The mass of the third body is derived to be larger than 4.3 (+/- 0.3) M-circle dot, and it should contribute to the total light of the system. However, no third light is detected during the photometric analyses. This indicates that it may be a black hole candidate orbiting the central mass-transferring binary in a triple system. During the evolution of this hierarchical triple-star system, the "eccentric Kozai-Lidov" mechanism may play a major role in the formation of the inner contact binary. This system seems a perfect candidate to be one of "merged" systems mentioned by Naoz & Fabrycky.

Funding ProjectChinese Natural Science Foundation[11703080] ; Chinese Natural Science Foundation[11873017] ; Yunnan Natural Science Foundation[2018FB006]
Funding OrganizationChinese Natural Science Foundation[11703080, 11873017] ; Yunnan Natural Science Foundation[2018FB006]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星物理学 ; 恒星形成与演化
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN2041-8205
URL查看原文
WOS IDWOS:000456875600003
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordORBITAL PERIOD MODULATION ; STARS ; COMPANIONS ; STATISTICS ; CATALOG
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/18963
Collection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
Corresponding AuthorZhao EG(赵二刚)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences(CAS), P.O. Box 110, 650216 Kunming, People's Republic of China
2.Key Laboratory of the Structure and Evolution of Celestial Objects, CAS, Kunming 650216, People's Republic of China
3.Center for Astronomical Mega-Science, CAS, 20A Datun Road, Chaoyang District, Beijing, 100012, People's Republic of China
4.University of the Chinese Academy of Sciences, Yuquan Road 19#, Sijingshang Block, 100049 Beijing, People's Republic of China
5.National Astronomical Research Institute of Thailand, Ministry of Science and Technology, BangKok, Thailand
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhao EG,Qian SB,Soonthornthum, Boonrucksar,et al. Two Massive Twins in a Deep-contact Binary with a Black Hole Candidate[J]. ASTROPHYSICAL JOURNAL LETTERS,2019,871(1):6.
APA Zhao EG.,Qian SB.,Soonthornthum, Boonrucksar.,Poshyachinda, Saran.,Zhou X.,...&Liao WP.(2019).Two Massive Twins in a Deep-contact Binary with a Black Hole Candidate.ASTROPHYSICAL JOURNAL LETTERS,871(1),6.
MLA Zhao EG,et al."Two Massive Twins in a Deep-contact Binary with a Black Hole Candidate".ASTROPHYSICAL JOURNAL LETTERS 871.1(2019):6.
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