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WZ CEPHEI: A CLOSE BINARY AT THE BEGINNING OF CONTACT PHASE
Zhu LY(朱俐颖)1,2; Qian SB(钱声帮)1,2; Zhu, LY (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊ASTRONOMICAL JOURNAL
2009-12
卷号138期号:6页码:2002-2006
DOI10.1088/0004-6256/138/6/2002
产权排序第1完成单位
收录类别SCI
关键词Binaries: Close Binaries: Eclipsing Stars: Evolution Stars: Individual (Wz Cephei)
摘要Photometric photoelectric data of the short-period close binary system, WZ Cephei, are presented. A new photometric analysis with the 2003 version of the Wilson-Devinney method confirmed that it is a shallow contact binary (f similar to 13.3%) with a high level of spot activity on the primary component. Combining new determined times of light minimum with the others published in the literature, the period change of the binary star is investigated. A periodic variation, with a period of 34.2 years and an amplitude of 0(d).013, was discovered to be superimposed on a long-term period decrease (dP/dt = -8.8 x 10(-8) days year(-1)). Both the secular period decrease and the shallow contact configuration suggest that this binary system is at the beginning of contact phase. It is on the way to evolving into a normal overcontact phase via secular angular momentum loss and/or mass transfer from the more massive component to the less massive one. The period oscillation can be explained either by the light-time effect due to the presence of a third body or by magnetic activity. On the one hand, if it is caused by the light-time effect, the mass and the orbital radius of the additional body should be m(3) = 0.17 M(circle dot) and a(3) = 26.6 AU, respectively, when this body is coplanar to the orbit of the eclipsing pair. On the other hand, since the system shows high levels of spot activity, the period oscillation may be explained as a consequence of magnetic cycles. In this case, the required variation of the quadrupole moment is calculated to be 9.2 x 10(49) g cm(2).
项目资助者The Chinese Academy of Sciences ; Yunnan Natural Science Foundation [2008CD157] ; National Key Fundamental Research Project [2007CB815406]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6256
URL查看原文
归档日期2009-11-20
WOS记录号WOS:000271630200036
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ORBITAL PERIOD MODULATION ; TERM STARSPOT EVOLUTION ; ACTIVITY CYCLE ; LIGHT CURVES ; PHOTOMETRIC MEASUREMENTS ; OVERCONTACT PHASE ; AR LACERTAE ; MASS ; CASSIOPEIAE ; PERSEI
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被引频次:12[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5816
专题双星与变星研究组
通讯作者Zhu, LY (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, China
2.Laboratory for the Structure and Evolution of Celestial Bodies, Chinese Academy of Sciences P.O. Box 110, 650011 Kunming, China
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Zhu LY,Qian SB,Zhu, LY . WZ CEPHEI: A CLOSE BINARY AT THE BEGINNING OF CONTACT PHASE[J]. ASTRONOMICAL JOURNAL,2009,138(6):2002-2006.
APA Zhu LY,Qian SB,&Zhu, LY .(2009).WZ CEPHEI: A CLOSE BINARY AT THE BEGINNING OF CONTACT PHASE.ASTRONOMICAL JOURNAL,138(6),2002-2006.
MLA Zhu LY,et al."WZ CEPHEI: A CLOSE BINARY AT THE BEGINNING OF CONTACT PHASE".ASTRONOMICAL JOURNAL 138.6(2009):2002-2006.
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