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DM Delphini: A Progenitor of a Contact Binary with a Compact Tertiary Companion
He JJ(何家佳)1,2,3; Qian SB(钱声帮)1,2,3; He, JJ (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
发表期刊PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
2010
卷号62期号:2页码:441-445
DOI10.1093/pasj/62.2.441
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 (Dm Delphini)
摘要The orbital period of the short-period eclipsing binary DM Del was analyzed by using two newly determined eclipse times together with the others compiled from the literature. It has been discovered that the period shows a long-time continuous decrease at a rate of dp/dt = -2.27 x 10(-7) d yr(-1), while it undergoes a cyclic variation with a period of 31.73 years. Meanwhile, photometric light curves of a close binary in the B and V bands, published by Gudur et al., were analyzed with the 2003 version of the W D code. It was found that the system is a semi-detached binary with a lobe-filling primary and a mass ratio of q = 0.55. The long-time period decrease can be explained by mass transfer from the primary to the secondary. This is consistent with the semi-detached configuration. The geometrical structure of the binary and the long-term period decrease suggest that DM Del may be a progenitor of an overcontact binary or just in a broken-contact stage predicted by thermal relaxation oscillations. A cyclic period change reveals the presence of a tertiary unseen companion that may play an important role in the formation of the close binary by removing angular momentum from the central system.
项目资助者Chinese Natural Science Foundation [10973037, 10903026, 10778718] ; National Key Fundamental Research Project [2007CB815406] ; Yunnan Natural Science Foundation [2008CD157]
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2010-07-09
WOS记录号WOS:000279834900020
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]URSAE MAJORIS SYSTEMS ; STARS ; ANDROMEDAE ; STAGE
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5846
专题双星与变星研究组
中国科学院天体结构与演化重点实验室
通讯作者He, JJ (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Yunnan, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, 650011 Kunming, Yunnan, P. R. China
2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, P. R. China
3.Graduate School of the Chinese Academy of Sciences, Yuquan Road 19#, SijingShan Block, 100049, Beijing City, P. R. China
推荐引用方式
GB/T 7714
He JJ,Qian SB,He, JJ . DM Delphini: A Progenitor of a Contact Binary with a Compact Tertiary Companion[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2010,62(2):441-445.
APA He JJ,Qian SB,&He, JJ .(2010).DM Delphini: A Progenitor of a Contact Binary with a Compact Tertiary Companion.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,62(2),441-445.
MLA He JJ,et al."DM Delphini: A Progenitor of a Contact Binary with a Compact Tertiary Companion".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 62.2(2010):441-445.
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