An Orbital Period Investigation of the Semi-Detached Near-Contact Binary DD Monocerotis

	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, S 3; Xiang, FY4 ; He JJ(何家佳)1,2
刊名	PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
	2009
卷号	61 期号:2 页码:333-337
关键词	stars: binaries: close stars: binaries : eclipsing stars: individual (DD Monocerotis) stars: stellar evolution
ISSN号	0004-6264
通讯作者	Qian, SB (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	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.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	CLOSE BINARIES ; SYSTEMS ; MODULATION ; STARS
收录类别	SCI
原文出处	http://pasj.oxfordjournals.org/content/61/2/333
语种	英语
WOS记录号	WOS:000266228300018
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/5830]
专题	云南天文台_双星与变星研究组
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
推荐引用方式 GB/T 7714	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.(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.