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THREE CLOSE BINARIES IN DIFFERENT EVOLUTIONARY STAGES IN THE OLD OPEN CLUSTER NGC 188
Zhu LY(朱俐颖)1,2,3; Qian SB(钱声帮)1,2,3; Soonthornthum, B4; Liu L(刘亮)1,2; He JJ(何家佳)1,2; Liu NP(刘念平)1,2,3; Zhao EG(赵二刚)1,2,3; Zhang J(张嘉)1,2,3; Wang JJ(王晶晶)1,2,3; Zhu, LY (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊ASTRONOMICAL JOURNAL
2014-02
卷号147期号:2
DOI10.1088/0004-6256/147/2/42
产权排序第1完成单位
收录类别SCI
关键词Binaries: Close Binaries: Eclipsing Stars: Evolution Stars: Individual (Ep cEp Es Cep V369 Cep)
摘要NGC 188 is a good laboratory for studying the formation and evolution of W UMa type contact binaries due to its rich populations of them. We present a detailed photometric study of three short-period close binaries, EP Cep, ES Cep, and V369 Cep, in the old open cluster NGC 188 based on our two-set photometric observations. We discovered that both EP Cep and ES Cep are shallow-contact binaries with continuously decreasing periods. The difference is in their mass ratios. EP Cep has an extremely low-mass ratio, q = 0.15, while ES Cep has a relatively high-mass ratio, q = 0.69, indicating that they lie in different evolutionary stages. ES Cep is likely a newly formed contact binary via a Case A mass transfer, while EP Cep is an evolved system and may be on the oscillations caused by the combined effect of the thermal relaxation oscillation and the variable angular momentum loss. For another system, V369 Cep, we found that it is a primary-filling near-contact binary. Both the semidetached configuration and the continuous decrease in the orbital period indicate that it is undergoing a mass transfer from the primary component to the secondary one. This conclusion is in agreement with the excess luminosity seen in the light curves on the ingress of the secondary minimum produced by the impact of the mass transfer. All of the results suggest that V369 Cep is evolving into contact, and a shallow-contact high-mass ratio system similar to ES Cep will be formed. Then, it will evolve into a low-mass ratio contact binary just like EP Cep, and finally merge into a rapidly rotating single star.
项目资助者Chinese Natural Science Foundation [11133007, 11325315, 11103074] ; Yunnan Province
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6256
URL查看原文
归档日期2014-02-14
WOS记录号WOS:000329837100018
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]THERMAL RELAXATION OSCILLATION ; CONTACT BINARIES ; VARIABLE-STARS ; LIGHT CURVES ; NGC-188 ; AGE ; SYSTEMS ; FIELD
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5908
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Zhu, LY (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
2.Key Laboratory for the Structure and Evolution of Celestial Bodies, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
3.Physical Sciences Department, Graduate University of the Chinese Academy of Sciences, Yuquan Road 19, Sijingshang Block, 100049 Beijing, China
4.National Astronomical Research Institute of Thailand/Ministry of Science and Technology, Bangkok, Thailand
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Zhu LY,Qian SB,Soonthornthum, B,et al. THREE CLOSE BINARIES IN DIFFERENT EVOLUTIONARY STAGES IN THE OLD OPEN CLUSTER NGC 188[J]. ASTRONOMICAL JOURNAL,2014,147(2).
APA Zhu LY.,Qian SB.,Soonthornthum, B.,Liu L.,He JJ.,...&Zhu, LY .(2014).THREE CLOSE BINARIES IN DIFFERENT EVOLUTIONARY STAGES IN THE OLD OPEN CLUSTER NGC 188.ASTRONOMICAL JOURNAL,147(2).
MLA Zhu LY,et al."THREE CLOSE BINARIES IN DIFFERENT EVOLUTIONARY STAGES IN THE OLD OPEN CLUSTER NGC 188".ASTRONOMICAL JOURNAL 147.2(2014).
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