THE TRIPLE BINARY STAR EQ TAU WITH AN ACTIVE COMPONENT

	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, SM 1; He JJ(何家佳)2,3
刊名	ASTRONOMICAL JOURNAL
	2014-05
卷号	147 期号:5
关键词	binaries: close binaries: eclipsing stars: individual (EQ Tau)
ISSN号	0004-6256
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.
产权排序	第二完成单位
英文摘要	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.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	LIGHT CURVES ; YY-CRB ; CONTACT ; PERIOD ; SYSTEMS ; PARAMETERS
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/0004-6256/147/5/98/meta
语种	英语
WOS记录号	WOS:000334591900005
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5902]
专题	云南天文台_双星与变星研究组云南天文台_中国科学院天体结构与演化重点实验室
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
推荐引用方式 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.(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).