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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
Source PublicationASTROPHYSICS AND SPACE SCIENCE
2016-02-01
Volume361Issue:2
DOI10.1007/s10509-016-2649-8
Indexed BySCI
KeywordStars: Binaries: Close Stars: Binaries: Eclipsing Stars: Individual (V781 Tau)
Abstract

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.

Funding ProjectNational 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]
Funding OrganizationNational 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]
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherSPRINGER
Publication PlaceVAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
ISSN0004-640X
URL查看原文
WOS IDWOS:000370805300017
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordECLIPSING BINARIES ; LIGHT CURVES ; PERIOD ; SYSTEM ; EVOLUTION
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/9342
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorGao, D. -Y.
Affiliation1.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
Recommended Citation
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).
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