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Comprehensive photometric study of an extremely low mass ratio deep contact binary in the globular cluster M4
Li, Kai1,2; Hu, Shaoming1; Chen, Xu1; Guo, Difu1
Source PublicationPUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
2017-10-01
Volume69Issue:5
DOI10.1093/pasj/psx064
Indexed BySCI
KeywordBinaries: Close Binaries: Eclipsing Blue Stragglers Globular Clusters: Individual (M4) Stars: Individual (V53)
Abstract

A comprehensive photometric study and an investigation of the orbital period variation of V53 in the globular cluster M4 are presented. The photometric study reveals that the mass ratio and the contact degree of V53 are q similar to 0.078 and f similar to 69%, respectively. The observed variation in the light curve can be explained by adjusting the spot parameters. V53 belongs to extreme mass ratio (q <= 0.25), deep contact (f >= 50%) binaries, and its mass ratio is close to the minimum mass ratio predicted by theoretical studies, making it a potential object for studying the evolution of binaries and the formation of blue stragglers and FK Com-type stars. The orbital period of V53 shows a long-term decrease at a rate of dp/dt = 5.89(+/- 0.02) x 10(-8) dyr(-1). This secular period decrease may be caused by the combination of mass transfer from the more massive component to the less massive component and an angular momentum loss via magnetic braking. As this mass transfer and angular momentum loss continues, V53 will ultimately evolve into a single fast-rotation star. By studying the statistics of all the contact binaries in globular clusters that have been analyzed, we found a possible correlation between the contact degree and whether or not a contact binary is a blue straggler. A contact binary is likely to become a blue straggler when its fill-out factor is more than 46.25(+/- 2.05)%. More samples should be introduced to confirm this preliminary result in the future.

Funding ProjectJoint Research Fund in Astronomy[U1431105] ; National Natural Science Foundation of China (NSFC)[ZR2014AQ019] ; Chinese Academy of Sciences (CAS)[ZR2014AQ019] ; Natural Science Foundation of Shandong Province[ZR2014AQ019] ; Young Scholars Program of Shandong University, Weihai[2016WHWLJH07] ; Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects[OP201303]
Funding OrganizationJoint Research Fund in Astronomy[U1431105] ; National Natural Science Foundation of China (NSFC)[ZR2014AQ019] ; Chinese Academy of Sciences (CAS)[ZR2014AQ019] ; Natural Science Foundation of Shandong Province[ZR2014AQ019] ; Young Scholars Program of Shandong University, Weihai[2016WHWLJH07] ; Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects[OP201303]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0004-6264
URL查看原文
WOS IDWOS:000412643200007
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordOVERCONTACT BINARY ; ECLIPSING BINARIES ; VARIABLE-STARS ; LIGHT CURVES ; PHYSICAL PARAMETERS ; VELOCITY CURVES ; CLOSE BINARIES ; SYSTEMS ; PERIOD ; EVOLUTION
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/11945
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorLi, Kai
Affiliation1.Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, 264209, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
Recommended Citation
GB/T 7714
Li, Kai,Hu, Shaoming,Chen, Xu,et al. Comprehensive photometric study of an extremely low mass ratio deep contact binary in the globular cluster M4[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2017,69(5).
APA Li, Kai,Hu, Shaoming,Chen, Xu,&Guo, Difu.(2017).Comprehensive photometric study of an extremely low mass ratio deep contact binary in the globular cluster M4.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,69(5).
MLA Li, Kai,et al."Comprehensive photometric study of an extremely low mass ratio deep contact binary in the globular cluster M4".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 69.5(2017).
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