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THE TRIPLE BINARY STAR EQ TAU WITH AN ACTIVE COMPONENT
Li K(李凯)1,2,3; Qian SB(钱声帮)2,3; Hu, SM1; He JJ(何家佳)2,3; Li, K (reprint author), Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China.
发表期刊ASTRONOMICAL JOURNAL
2014-05
卷号147期号:5
DOI10.1088/0004-6256/147/5/98
产权排序第2完成单位
收录类别SCI
关键词Binaries: Close Binaries: Eclipsing Stars: Individual (Eq Tau)
摘要New photometric data of EQ Tau observed in 2010 and 2013 are presented. Light curves obtained in 2000 and 2004 by Yuan & Qian and 2001 by Yang & Liu, together with our two newly determined sets of light curves, were analyzed using the Wilson-Devinney code. The five sets of light curves exhibit very obvious variations, implying that the light curves of EQ Tau show a strong O'Connell effect. We found that EQ Tau is an A-type shallow contact binary with a contact degree of f = 11.8%; variable dark spots on the primary component of EQ Tau were also observed. Using 10 new times of minimum light, together with those collected from the literature, the orbital period change of EQ Tau was analyzed. We found that its orbital period includes a secular decrease (dP/dt = -3.63 x 10(-8) days yr(-1)) and a cyclic oscillation (A(3) = 0.0058 days and P-3 = 22.7 yr). The secular increase of the period can be explained by mass transfer from the more massive component to the less massive one or/and angular momentum loss due to a magnetic stellar wind. The Applegate mechanism cannot explain the cyclic orbital period change. A probable transit-like event was observed in 2010. Therefore, the cyclic orbital period change of EQ Tau may be due to the light time effect of a third body.
项目资助者Chinese Natural Science Foundation [11203066, 11133007, 11103074] ; Key Laboratory for the Structure and Evolution of Celestial Objects [OP201303]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6256
URL查看原文
WOS记录号WOS:000334591900005
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]LIGHT CURVES ; YY-CRB ; CONTACT ; PERIOD ; SYSTEMS ; PARAMETERS
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被引频次:11[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/114a53/5902
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Li, K (reprint author), 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 Science and School of Space Science and Physics, Shandong University, Weihai, Weihai 264209, China
2.Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, China
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
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GB/T 7714
Li K,Qian SB,Hu, SM,et al. THE TRIPLE BINARY STAR EQ TAU WITH AN ACTIVE COMPONENT[J]. ASTRONOMICAL JOURNAL,2014,147(5).
APA Li K,Qian SB,Hu, SM,He JJ,&Li, K .(2014).THE TRIPLE BINARY STAR EQ TAU WITH AN ACTIVE COMPONENT.ASTRONOMICAL JOURNAL,147(5).
MLA Li K,et al."THE TRIPLE BINARY STAR EQ TAU WITH AN ACTIVE COMPONENT".ASTRONOMICAL JOURNAL 147.5(2014).
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