PROPERTIES OF THE CLOSE-IN TERTIARY IN THE QUADRUPLE SYSTEM V401 CYG

	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
刊名	ASTRONOMICAL JOURNAL
	2013-08
卷号	146 期号:2 页码:28-
关键词	binaries: close binaries: eclipsing stars: individual (V401 Cyg)
ISSN号	0004-6256
通讯作者	Zhu, LY (reprint author), Chinese Acad Sci, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	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.
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]	URSAE MAJORIS SYSTEMS ; ADDITIONAL COMPONENTS ; HIERARCHICAL TRIPLE ; CONTACT BINARIES ; PERIOD CHANGES ; Y-SEXTANTIS ; GIANT ; STARS
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/0004-6256/146/2/28/meta
语种	英语
WOS记录号	WOS:000321841100010
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5882]
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.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
推荐引用方式 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-.