Detection of a tertiary companion in the eclipsing binary AD Andromeda

	Detection of a tertiary companion in the eclipsing binary AD Andromeda
	Liao WP(廖文萍)1,2,3 ; Qian SB(钱声帮)1,2,3
刊名	NEW ASTRONOMY
	2009-04
卷号	14 期号:3 页码:249-253
关键词	Stars: binaries: close Stars: binaries: eclipsing Stars: individuals: AD Andromeda Stars: multiple
ISSN号	1384-1076
通讯作者	Liao, WP (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	New orbital period variation of the eclipsing binary, AD Andromeda, was analyzed based on one CCD photometric times of minimum we have obtained and all available photoelectric and CCD values collected from the literatures. It is discovered that the orbital period of the binary shows a periodic oscillation with a period of 14.38 years and an amplitude of 0.0186 days. The periodic oscillation can be explained by the light-time effect via the presence of a tertiary component in a nearly circular orbit with a small eccentricity of e = 0.30 in the system. Based on the present analysis, it is estimated that the mass of the third body is no less than 1.76(+/- 0.08) M., and it should contribute light to the total system. Meanwhile, the photoelectric light curve obtained in yellow light by Rucinski [Rucinski, S.M., 1966. AcA 16, 307] was reanalyzed with the 2003 version of the W-D code. The results show that AD Andromeda is a detached eclipsing binary, and photometric solutions were computed. Based on the analysis, we obtained a small amount of third light in the system (L(3V) similar to 0.001), which is too small for the contribution of the tertiary companion star. The low luminosity of the third companion may be explained in two possible ways, either: (1) the third companion might itself be a close double star consisting of two stars of 0.88 solar masses, or (2) it is a dark star such as a neutron star. We think the first possibility is a more likely one than a neutron star companion. New photometric and spectroscopic observations and a detailed investigation of those data are urgently required in the future. (C) 2008 Elsevier B.V. All rights reserved.
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]	ORBITAL PERIOD ; LIGHT CURVES
收录类别	SCI
原文出处	http://www.sciencedirect.com/science/article/pii/S1384107608000924
语种	英语
WOS记录号	WOS:000261990100005
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5826]
专题	云南天文台_双星与变星研究组
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, PR China 2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), 100012 Beijing, PR China 3.Graduate School of the CAS, Beijing, PR China
推荐引用方式 GB/T 7714	Liao WP,Qian SB. Detection of a tertiary companion in the eclipsing binary AD Andromeda[J]. NEW ASTRONOMY,2009,14(3):249-253.
APA	Liao WP,&Qian SB.(2009).Detection of a tertiary companion in the eclipsing binary AD Andromeda.NEW ASTRONOMY,14(3),249-253.
MLA	Liao WP,et al."Detection of a tertiary companion in the eclipsing binary AD Andromeda".NEW ASTRONOMY 14.3(2009):249-253.