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An Orbital Period Investigation of the Semi-Detached Near-Contact Binary DD Monocerotis
Qian SB(钱声帮)1,2; Zhu LY(朱俐颖)1,2; Boonrucksar, S3; Xiang, FY4; He JJ(何家佳)1,2; Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan 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:2页码:333-337
DOI10.1093/pasj/61.2.333
产权排序第1完成单位
收录类别SCI
关键词Stars: Binaries: Close Stars: Binaries : Eclipsing Stars: Individual (Dd Monocerotis) Stars: Stellar Evolution
摘要The variations of the orbital period of the near-contact binary system DD Monocerotis were analyzed based on three new CCD times of light minimum together with others compiled from the literature. The general trend of the (O - C)(1) Curve indicates a continuous period increase at a rate of dP/dt = + 1.40 x 10(-7) d yr(-1). Meanwhile, by using all available photoelectric and CCD data, a small-amplitude period oscillation (A = 0.0039 d; T = 18.8 yr) was found to be Superimposed on the period increase. The continuous period increase is explained by mass transfer from the less-massive component to the more-massive one (dM(2)/dt = +6.99 x 10(-8) M(circle dot) yr(-1)) which is consistent with the semi-detached configuration of the binary with a lobe-filling secondary discovered by Qian et al. (1997, A&AS, 125, 475). We showed that the timescale of the period change is close to the thermal time scale of the secondary, suggesting that DD Monocerotis is undergoing a case A mass transfer. The small-amplitude period oscillation reveals the presence of an extremely cool stellar companion (M(3)sin i' = 0.13 M(circle dot)) in the system. Accumulation of photoelectric and CCD data will discover small-amplitude cyclic changes in many close binary stars in the future.
项目资助者National Key Fundamental Research Project [2007CB815406] ; Special Foundation of President and West Light Foundation of the Chinese Academy of Sciences ; Yunnan Natural Science Foundation [2008CD157] ; Chinese Nature Science Foundation [10778718, 10778708] ; Scientific Foundation Fund of Hunan Provincial Education Department [08A072]
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2009-05-21
WOS记录号WOS:000266228300018
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]CLOSE BINARIES ; SYSTEMS ; MODULATION ; STARS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/5830
专题双星与变星研究组
通讯作者Qian, SB (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, P. R. China
2.United Laboratory of Optical Astronomy, Chinese Academy of Sciences (ULOAC), 100012 Beijing, P. R. China
3.National Astronomical Research Institute, Chiang Mai 50200, Thailand
4.Physics Department, Xiangtan University, 411105 Xiangtan, Funan Province, P.R. China
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Qian SB,Zhu LY,Boonrucksar, S,et al. An Orbital Period Investigation of the Semi-Detached Near-Contact Binary DD Monocerotis[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2009,61(2):333-337.
APA Qian SB,Zhu LY,Boonrucksar, S,Xiang, FY,He JJ,&Qian, SB .(2009).An Orbital Period Investigation of the Semi-Detached Near-Contact Binary DD Monocerotis.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,61(2),333-337.
MLA Qian SB,et al."An Orbital Period Investigation of the Semi-Detached Near-Contact Binary DD Monocerotis".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 61.2(2009):333-337.
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