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PROPERTIES OF THE CLOSE-IN TERTIARY IN THE QUADRUPLE SYSTEM V401 CYG
Zhu LY(朱俐颖)1,2,3; Qian SB(钱声帮)1,2,3; Zhou X(周肖)1,2,3; Li LJ(李临甲)1,2,3; Zhao EG(赵二刚)1,2; Liu L(刘亮)1,2; Liu NP(刘念平)1,2,3
Source PublicationASTRONOMICAL JOURNAL
2013-08
Volume146Issue:2Pages:28-
DOI10.1088/0004-6256/146/2/28
Contribution Rank第1完成单位
Indexed BySCI
KeywordBinaries: Close Binaries: Eclipsing Stars: Individual (V401 Cyg)
Abstract

V401 Cyg is a quadruple system in which the spectroscopic signature of a close-in tertiary and a distant visual companion star were reported. Orbital properties of the close-in companion should provide valuable information on the formation of close binaries and stellar dynamical interaction. By analyzing new times of minimum light together with those collected from the literature, we discovered that the observed-calculated (O - C) curve of V401 Cyg shows a cyclic change with a short period of 3.5 yr and a semi-amplitude of 0.00436 days while it undergoes an upward parabolic variation. Those photoelectric and CCD data covered more than two cycles and were analyzed for the light-travel time effect via the presence of the tertiary companion. The mass of the third body was determined to be M-3 sin i' = 0.65(+/- 0.08) M-circle dot, which is close to the value estimated from the spectroscopic data (M-3 similar to 0.64 M-circle dot). This reveals that the orbital inclination of the tertiary was about i' similar to 90 degrees, indicating that the contact components of V401 Cyg have the possibility of being eclipsed by the tertiary at an orbital distance of about 3.0 AU, and it may be a triply eclipsing hierarchical triple system. The upward parabolic change indicates a period increase at a rate of (P) over dot = 1.5 x 10(-7) revealing a mass transfer from the secondary to the primary ((M) over dot(2) = 5.9 x 10(-8) M-circle dot yr(-1)). This is consistent with the predictions of the theory of thermal relaxation oscillation (TRO) suggesting that V401 Cyg is undergoing an expanding-orbit stage in the TRO cycles.

Funding ProjectChinese Natural Science Foundation[11133007] ; Chinese Natural Science Foundation[11103074] ; West Light Foundation of the Chinese Academy of Sciences
Funding OrganizationChinese Natural Science Foundation[11133007, 11103074] ; West Light Foundation of the Chinese Academy of Sciences
Language英语
Subject Area天文学 ; 恒星与银河系
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-6256
URL查看原文
Archive Date2013-07-12
WOS IDWOS:000321841100010
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordURSAE MAJORIS SYSTEMS ; ADDITIONAL COMPONENTS ; HIERARCHICAL TRIPLE ; CONTACT BINARIES ; PERIOD CHANGES ; Y-SEXTANTIS ; GIANT ; STARS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/5882
Collection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
Corresponding AuthorZhu LY(朱俐颖)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences (CAS), P.O. Box 110, 650011 Kunming, China
2.Key Laboratory of the Structure and Evolution Celestial Bodies, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
3.University of the Chinese Academy of Sciences, Yuquan Road 19, Sijingshang Block, 100049 Beijing, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhu LY,Qian SB,Zhou X,et al. PROPERTIES OF THE CLOSE-IN TERTIARY IN THE QUADRUPLE SYSTEM V401 CYG[J]. ASTRONOMICAL JOURNAL,2013,146(2):28-.
APA Zhu LY.,Qian SB.,Zhou X.,Li LJ.,Zhao EG.,...&Liu NP.(2013).PROPERTIES OF THE CLOSE-IN TERTIARY IN THE QUADRUPLE SYSTEM V401 CYG.ASTRONOMICAL JOURNAL,146(2),28-.
MLA Zhu LY,et al."PROPERTIES OF THE CLOSE-IN TERTIARY IN THE QUADRUPLE SYSTEM V401 CYG".ASTRONOMICAL JOURNAL 146.2(2013):28-.
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