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Two unusual contact binaries in the globular cluster M54
Li K(李凯)1,2,3; Qian SB(钱声帮)1,2,3
Source PublicationNEW ASTRONOMY
2013-08
Volume22Pages:57-61
DOI10.1016/j.newast.2013.01.006
Contribution Rank第1完成单位
Indexed BySCI
KeywordGlobular Clusters: Individual: M54 Stars: Binaries: Close Stars: Binaries: Eclipsing Stars: Blue Stragglers
Abstract

B, V and I light curves of V134 and B and V light curves of V144 have been analyzed by the W-D code. It is found that V134 is a middle mass ratio (q = 0.530) deep contact binary with a contact degree of f = 50.6% and V144 is an extremely low mass ratio (q = 0.160) shallow contact binary with a contact degree of f = 19.5%. The light curves of both of the two binaries show obvious O'Connell effect, this can be explained by employing dark spots on their secondary components. Based on the derived acceleration of gravity at the surface of the components, we found that the two contact binaries are very special, both components of the two binaries have possibly evolved off the main sequence and are likely to be subgiant stars. On the color-magnitude of M54, both of the two binaries are located in the blue straggler region. They are blue straggler candidates and may be formed by mass transfer. (C) 2013 Elsevier B.V. All rights reserved.

Funding ProjectChinese Natural Science Foundation[11133007] ; Chinese Natural Science Foundation[10973037] ; Chinese Natural Science Foundation[10903026] ; Chinese Natural Science Foundation[11103074] ; West Light Foundation of the Chinese Academy of Sciences
Funding OrganizationChinese Natural Science Foundation[11133007, 10973037, 10903026, 11103074] ; West Light Foundation of the Chinese Academy of Sciences
Language英语
Subject Area天文学 ; 恒星与银河系
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherELSEVIER SCIENCE BV
Publication PlacePO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
ISSN1384-1076
URL查看原文
WOS IDWOS:000316093300009
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordSAGITTARIUS DWARF GALAXY ; LIGHT CURVES ; VARIABLE-STARS ; BLACK-HOLE ; SYSTEMS ; DEEP
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5884
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 AuthorLi K(李凯)
Affiliation1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, China
3.Graduate School of the CAS, 100049 Beijing, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Li K,Qian SB. Two unusual contact binaries in the globular cluster M54[J]. NEW ASTRONOMY,2013,22:57-61.
APA Li K,&Qian SB.(2013).Two unusual contact binaries in the globular cluster M54.NEW ASTRONOMY,22,57-61.
MLA Li K,et al."Two unusual contact binaries in the globular cluster M54".NEW ASTRONOMY 22(2013):57-61.
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