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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.
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2011-08
卷号415期号:4页码:3006-3012
DOI10.1111/j.1365-2966.2011.18914.x
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: Eq Cep Stars: Individual: Er Cep Stars: Individual: V371 Cep
摘要In 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.
项目资助者Chinese 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
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0035-8711
URL查看原文
归档日期2012-01-23
WOS记录号WOS:000294204900003
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]VARIABLE-STARS ; NGC-188 ; SYSTEM ; FIELD
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被引频次:17[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/114a53/5852
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Liu, L (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.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
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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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