The active W UMa type binary star V781 Tau revisited

doi:10.1007/s10509-016-2649-8

	The active W UMa type binary star V781 Tau revisited
	Li, K.1,2 ; Gao, D. -Y.1; Hu, S. -M.1; Guo, D. -F.1; Jiang, Y. -G.1; Chen, X.1
发表期刊	ASTROPHYSICS AND SPACE SCIENCE
	2016-02-01
卷号	361 期号:2
DOI	10.1007/s10509-016-2649-8
收录类别	SCI
关键词	Stars: Binaries: Close Stars: Binaries: Eclipsing Stars: Individual (V781 Tau)
摘要	In this paper, new determined BVRcIc light curves and radial velocities of V781 Tau are presented. By analyzing the light curves and radial velocities simultaneously, we found that V781 Tau is a W-subtype medium contact binary star with a mass ratio of q = 2.207 +/- 0.005 and a contact degree of f = 21.6(+/- 1.0) %. The difference between the two light maxima was explained by a dark spot on the less massive primary component. The change of the orbital period of V781 Tau was also investigated. A secular decrease at a rate of -6.01(+/- 2.28) x 10(-8) d/yr and a cyclic modulation with a period of 44.8 +/- 5.7 yr and an amplitude of 0.0064 +/- 0.0011 day were discovered. The continuous period decrease may be caused by angular momentum loss due to a magnetic stellar wind. The Applegate mechanism failed to explain the cyclic modulation. It is highly possible that the cyclic oscillation is the result of the light travel time effect by a third companion.
资助项目	National Natural Science Foundation of China[11203016] ; National Natural Science Foundation of China[U1431105] ; Natural Science Foundation of Shandong Province[ZR2014AQ019] ; Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects[OP201303]
项目资助者	National Natural Science Foundation of China[11203016, U1431105] ; Natural Science Foundation of Shandong Province[ZR2014AQ019] ; Open Research Program of Key Laboratory for the Structure and Evolution of Celestial Objects[OP201303]
语种	英语
学科领域	天文学 ; 恒星与银河系 ; 恒星天文学
文章类型	Article
出版者	SPRINGER
出版地	VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
ISSN	0004-640X
URL	查看原文
WOS记录号	WOS:000370805300017
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	ECLIPSING BINARIES ; LIGHT CURVES ; PERIOD ; SYSTEM ; EVOLUTION
引用统计	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/114a53/9342
专题	中国科学院天体结构与演化重点实验室
通讯作者	Gao, D. -Y.
作者单位	1.Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai, 264209, China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, Yunnan, China
推荐引用方式 GB/T 7714	Li, K.,Gao, D. -Y.,Hu, S. -M.,et al. The active W UMa type binary star V781 Tau revisited[J]. ASTROPHYSICS AND SPACE SCIENCE,2016,361(2).
APA	Li, K.,Gao, D. -Y.,Hu, S. -M.,Guo, D. -F.,Jiang, Y. -G.,&Chen, X..(2016).The active W UMa type binary star V781 Tau revisited.ASTROPHYSICS AND SPACE SCIENCE,361(2).
MLA	Li, K.,et al."The active W UMa type binary star V781 Tau revisited".ASTROPHYSICS AND SPACE SCIENCE 361.2(2016).

条目包含的文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
The active W UMa typ（1117KB）	期刊论文	出版稿	开放获取	CC BY-NC-SA	浏览请求全文