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; Li, Kai(Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China)
发表期刊PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
2017-10-01
卷号69期号:5
DOI10.1093/pasj/psx064
收录类别SCI
关键词Binaries: Close Binaries: Eclipsing Blue Stragglers Globular Clusters: Individual (M4) Stars: Individual (V53)
摘要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.
项目资助者Joint 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)
语种英语
学科领域天文学
文章类型Article
ISSN0004-6264
URL查看原文
WOS记录号WOS:000412643200007
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]OVERCONTACT BINARY ; ECLIPSING BINARIES ; VARIABLE-STARS ; LIGHT CURVES ; PHYSICAL PARAMETERS ; VELOCITY CURVES ; CLOSE BINARIES ; SYSTEMS ; PERIOD ; EVOLUTION
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被引频次:1[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/114a53/11945
专题中国科学院天体结构与演化重点实验室
通讯作者Li, Kai(Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China)
作者单位1.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
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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,&Li, Kai.(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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