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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
Source PublicationASTRONOMICAL JOURNAL
2014-02
Volume147Issue:2
DOI10.1088/0004-6256/147/2/42
Contribution Rank第1完成单位
Indexed BySCI
Keywordbinaries: close binaries: eclipsing stars: evolution stars: individual (EP Cep, ES Cep, V369 Cep)
Abstract

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.

Funding ProjectChinese Natural Science Foundation[11133007] ; Chinese Natural Science Foundation[11325315] ; Chinese Natural Science Foundation[11103074] ; Yunnan Province
Funding OrganizationChinese Natural Science Foundation [11133007, 11325315, 11103074] ; Yunnan Province
Language英语
Subject Area天文学 ; 恒星与银河系 ; 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
ISSN0004-6256
URL查看原文
Archive Date2014-02-14
WOS IDWOS:000329837100018
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordTHERMAL RELAXATION OSCILLATION ; CONTACT BINARIES ; VARIABLE-STARS ; LIGHT CURVES ; NGC-188 ; AGE ; SYSTEMS ; FIELD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5908
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 AuthorZhu LY(朱俐颖)
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
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.,...&Wang JJ.(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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