Z Draconis with two companions in a 2:1 mean-motion resonance

	Z Draconis with two companions in a 2:1 mean-motion resonance
	Yuan, Jin-Zhao1 ; Senavci, Hakan Volkan 2; Qian SB(钱声帮)3
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2016-05-01
卷号	16 期号:5
关键词	binaries: close stars: individual (Z Draconis) methods: numerical
ISSN号	1674-4527
通讯作者	Yuan, JZ (reprint author), Shanxi Normal Univ, Dept Phys, Linfen 041004, Peoples R China
产权排序	第三完成单位
英文摘要	All available mid-eclipse times of the eclipsing binary Z Draconis are analyzed, and three sets of cyclic variations with periods of 20.1, 29.96 and 59.88 yr are found. The low-amplitude variations with a period of 20.1 yr may be attributed to the unavoidable slight imperfection in the double-Keplerian model, which gives periods of 29.96 and 59.88 yr. Interestingly, the Z Draconis system is close to a 2: 1 mean-motion resonance, or a 6: 3: 2 mean-motion resonance if the 20.1 yr period really exists. We also find that the best solutions tend to give the minimum eccentricities. Based on Kepler's third law, the outermost companion has a minimum mass of similar to 0.77 M-circle dot, whereas the middle companion is an M dwarf star with a mass of similar to 0.40 M-circle dot, suggesting that Z Draconis is a general N-body system.
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]	THERMAL RELAXATION OSCILLATION ; PLANETARY SYSTEM HYPOTHESIS ; BINARIES ; DETECTABILITY
收录类别	SCI
原文出处	http://iopscience.iop.org/article/10.1088/1674-4527/16/5/081/meta
语种	英语
WOS记录号	WOS:000375793000012
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/9592]
专题	云南天文台_双星与变星研究组
作者单位	1.Department of Physics, Shanxi Normal University, Linfen 041004, China 2.Department of Astronomy and Space Sciences, Ankara University, Faculty of Science, TR-06100 Tandoǧan-Ankara, Turkey 3.Yunnan Observatories, Chinese Academy of Sciences, 650011 Kunming, China
推荐引用方式 GB/T 7714	Yuan, Jin-Zhao,Senavci, Hakan Volkan,Qian SB. Z Draconis with two companions in a 2:1 mean-motion resonance[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2016,16(5).
APA	Yuan, Jin-Zhao,Senavci, Hakan Volkan,&Qian SB.(2016).Z Draconis with two companions in a 2:1 mean-motion resonance.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,16(5).
MLA	Yuan, Jin-Zhao,et al."Z Draconis with two companions in a 2:1 mean-motion resonance".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 16.5(2016).