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New Period Investigation of Algol-like Near-Contact Binary EG Cephei
Zhu LY(朱俐颖)1,2; Qian SB(钱声帮)1,2; Liao WP(廖文萍)1,3; Miloslav, Z4; Zdenek, M4; Ying, ZL (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
发表期刊PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
2009
卷号61期号:3页码:529-533
DOI10.1093/pasj/61.3.529
产权排序第1完成单位
收录类别SCI
关键词Stars: Binaries: Eclipsing Stars: Evolution Stars: Individual (Eg Cephei)
摘要The Algol-like Near Contact Binary EG Cephei was observed in 2008 October. One new observed time of the secondary minimum was derived in B V(IR)(c) bands. It turns out that the times of minima at longer wavelengths occur earlier than the shorter ones. All of the available eclipse times, including 735 epochs, spanning more than 100 years were analyzed. A period oscillation with a period of 35.8 (+/- 0.1) yr and an amplitude of about 0.0037(+/- 0.0002)d was found, while undergoing a secular increase at a rate of dP/dt = 3.4 x 10(-8)(+/- 0.1) d yr(-1). This continuous period increase may be caused by mass transfer from the secondary component to the primary one on a thermal timescale, which is consistent with the Algol-like semi-detached configuration of EG Cep. Combining with the spectroscopic and photometric results, we derived a conservative mass-transfer rate of this target, dM/dt = 3.0 (+/- 0.1) x 10(-8) M(circle dot) yr(-1). The oscillation part of the period variation may be the result of a light-time effect due to the existence of a coplanar additional body with a mass of M(3) = 0.11 M(circle dot), and a corresponding radius of a(3) = 14 AU. The presumed third body may play an important role in the evolution of this system.
项目资助者Special Foundation of President of The Chinese Academy of Sciences and West Light Foundation ; Chinese Academy of Sciences, Yunnan Natural Science Foundation [2008CD157] ; Chinese Nature Science Foundation [10778707] ; National Key Fundamental Research Project [2007C13815406]
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6264
URL查看原文
归档日期2009-06-19
WOS记录号WOS:000268368900017
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]ADDITIONAL COMPONENTS ; SYSTEM ; AURIGAE
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被引频次:2[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/114a53/5831
专题双星与变星研究组
通讯作者Ying, ZL (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron 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, P. R. China
2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), 100012 Beijing, P. R. China
3.Graduate School of the Chinese Academy of Sciences, 100049 Beijing P. R. China
4.Institute of Theoretical Physics and Astrophysics, Masaryk University, Kotlárská 2, 611 37 Brno, Czech Republic
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Zhu LY,Qian SB,Liao WP,et al. New Period Investigation of Algol-like Near-Contact Binary EG Cephei[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2009,61(3):529-533.
APA Zhu LY,Qian SB,Liao WP,Miloslav, Z,Zdenek, M,&Ying, ZL .(2009).New Period Investigation of Algol-like Near-Contact Binary EG Cephei.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,61(3),529-533.
MLA Zhu LY,et al."New Period Investigation of Algol-like Near-Contact Binary EG Cephei".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 61.3(2009):529-533.
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