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Photometric investigation of three W UMa-type binary stars in the old open cluster NGC 188
Liu L(刘亮)1,2,3,4; Qian SB(钱声帮)1,2,3,4; Zhu LY(朱俐颖)1,2,3; He JJ(何家佳)1,2,3; Liao WP(廖文萍)1,2,3; Li LJ(李临甲)1,2,3,4; Zhao EG(赵二刚)1,2,3,4; Wang JJ(王晶晶)1,2,3,4; Liu, L (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2011-08
Volume415Issue:4Pages:3006-3012
DOI10.1111/j.1365-2966.2011.18914.x
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries: Close Binaries: Eclipsing Stars: Evolution Stars: Individual: Eq Cep Stars: Individual: Er Cep Stars: Individual: V371 Cep
AbstractIn a programme to understand the evolution of contact binaries, we have re-observed EQ Cep, ER Cep and V371 Cep, which are members of the old open cluster NGC 188, photometrically. Combining our photometric solutions with some known parameters of the cluster, we derived the mass and the radius for each component. Meanwhile, we investigated the period changes of the three systems, finding a long-term increase of period in every system and discovering two cyclic variations in ER Cep besides the long-term changes (T(3) = 5.40 +/- 0.01 yr, A(3) = 0.0135 +/- 0.0016 d; T(4) = 17.6 +/- 0.1 yr). From the derived physical parameters and analysis of the orbital period, we conclude that (i) both components of V371 Cep have very possibly evolved off the main sequence, as a result of the derived accelerations of gravity log g(1) = 3.93 and log g(2) = 3.98, and (ii) ER Cep is at least a triple, or even quadruple, system, something suggested by the overmassive derived total mass (similar to 3.51 M(circle dot)) and the 5.4-yr-cycle periodic oscillation.
Funding OrganizationChinese Natural Science Foundation [10973037, 10903026] ; National Key Fundamental Research Project [2007CB815406] ; Yunnan Natural Science Foundation [2008CD157] ; West Light Foundation of the Chinese Academy of Sciences
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN0035-8711
URL查看原文
Archive Date2012-01-23
WOS IDWOS:000294204900003
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordVARIABLE-STARS ; NGC-188 ; SYSTEM ; FIELD
Citation statistics
Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5852
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 AuthorLiu, L (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
Affiliation1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, 650011 Kunming, China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650011 Kunming, China
3.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), 100012 Beijing, China
4.Graduate School of the CAS, Yuquan Road 19, Shijingshan Block, 100049 Beijing, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Liu L,Qian SB,Zhu LY,et al. Photometric investigation of three W UMa-type binary stars in the old open cluster NGC 188[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2011,415(4):3006-3012.
APA Liu L.,Qian SB.,Zhu LY.,He JJ.,Liao WP.,...&Liu, L .(2011).Photometric investigation of three W UMa-type binary stars in the old open cluster NGC 188.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,415(4),3006-3012.
MLA Liu L,et al."Photometric investigation of three W UMa-type binary stars in the old open cluster NGC 188".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 415.4(2011):3006-3012.
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