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An orbital period investigation of the Algol-type eclipsing binary VW Hydrae
Zhang J(张嘉)1,2; Qian SB(钱声帮)1; Soonthornthum, B3; Zhang, J (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
2009-03
卷号9期号:3页码:307-314
DOI10.1088/1674-4527/9/3/005
产权排序第1完成单位
收录类别SCI
关键词Stars: Binaries: Close Stars: Binaries: Eclipsing Multiple Stars Stars: Individual (Vw Hya)
摘要Orbital period variations of the Algol-type eclipsing binary, VW Hydrae, are analyzed based on one newly determined eclipse time and the other times of light minima collected from the literature. It is discovered that the orbital period shows a continuous increase at arate of dP/dt = +6.34 x 10(-7) d yr(-1) while it undergoes acyclic change with an amplitude of 0.0639 d and a period of 51.5 yr. After the long-term period increase and the large-amplitude period oscillation were subtracted from the O-C curve, the residuals of the photoelectric and CCD data indicate a small-amplitude cyclic variation with a period of 8.75 yr and a small amplitude of 0.0048 d. The continuous period increase indicates a conservative mass transfer at a rate of dM(2)/dt = 7.89 x 10(-8) M(circle dot) yr(-1) from the secondary to the primary. The period increase may be caused by a combination of the mass transfer from the secondary to the primary and the angular momentum transfer from the binary system to the circumbinary disk. The two cyclic period oscillations can be explained by light-travel time effects via the presence of additional bodies. The small-amplitude periodic change indicates the existence of a less massive component with mass M(3) > 0.53 M(circle dot), while the large-amplitude one is caused by the presence of a more massive component with mass M(4) > 2.84 M(circle dot). The ultraviolet source in the system reported by Kviz & Rufener (1987) may be one of the additional components, and it is possible that the more massive one may be an unseen neutron star or black hole. The rapid period increase and the possibility of the presence of two additional components in the binary make it a very interesting system to study. New photometric and high-resolution spectroscopic observations and a detailed investigation of those data are required m the future.
项目资助者Yunnan Natural Science Foundation [2005A0059M] ; National Natural Science Foundation of China [10573032, 10433030, 10573013] ; Chinese Academy of Sciences [O8ZKY11001] ; Ministry of Science and Technology of the Peoples Republic of China [2007CB815406]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN1674-4527
URL查看原文
归档日期2009-05-21
WOS记录号WOS:000264845200005
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]CLOSE BINARIES ; MASS-TRANSFER ; LIGHT CURVES ; MODULATION ; SYSTEMS ; CYGNI
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5828
专题双星与变星研究组
通讯作者Zhang, J (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
2.Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
3.National Astronomical Research Institute of Thailand/Ministry of Science and Technology, Bangkok, Thailand
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Zhang J,Qian SB,Soonthornthum, B,et al. An orbital period investigation of the Algol-type eclipsing binary VW Hydrae[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(3):307-314.
APA Zhang J,Qian SB,Soonthornthum, B,&Zhang, J .(2009).An orbital period investigation of the Algol-type eclipsing binary VW Hydrae.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(3),307-314.
MLA Zhang J,et al."An orbital period investigation of the Algol-type eclipsing binary VW Hydrae".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.3(2009):307-314.
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