The active W UMa type binary star V781 Tau revisited

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	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
刊名	ASTROPHYSICS AND SPACE SCIENCE
	2016-02
卷号	361 期号:2
关键词	Stars: binaries: close Stars: binaries: eclipsing Stars: individual (V781 Tau)
ISSN号	0004-640X
通讯作者	Gao, DY (reprint author), Shandong Univ, Inst Space Sci, Shandong Prov Key Lab Opt Astron & Solar Terr Env, Weihai 264209, Peoples R China.
英文摘要	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.
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]	ECLIPSING BINARIES ; LIGHT CURVES ; PERIOD ; SYSTEM ; EVOLUTION
收录类别	SCI
原文出处	http://link.springer.com/article/10.1007%2Fs10509-016-2649-8
语种	英语
WOS记录号	WOS:000370805300017
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/9342]
专题	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 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).