Channels for the formation of double degenerates and a Monte-Carlo analysis

	Channels for the formation of double degenerates and a Monte-Carlo analysis
	Han ZW(韩占文)1,2 ; Han, ZW
刊名	CHINESE ASTRONOMY AND ASTROPHYSICS
	1999-01
卷号	23 期号:1 页码:75-88
关键词	binaries supernovae white dwarfs stellar evolution
ISSN号	0275-1062
通讯作者	Han, ZW
产权排序	第一完成单位
英文摘要	I consider three evolutionary channels leading to the formation of double degenerate (DD) binary systems, "stable Roche lobe overflow (RLOF) plus common envelope (CE)", "CE plus CE", and "exposed core plus CE". I carry out Monte-Carlo simulations and examine the effects of model parameters (tidal enhancement of wind, mass transfer efficiency in the stable RLOF, CE ejection efficiency, the initial mass ratio distribution) on the results. My model successfully explains the formation of DDs and the observed distributions of their masses, mass ratios, and orbital periods, as well as the birth rates of DDs and Type Ia supernovae. Specifically, (1) Stable RLOF plus CE and CE plus CE are the main channels, (2) the Galactic birth rate of DDs is 0.03 yr(-1) and that of DDs with helium white dwarfs (Re WDs) as primaries is 0.017 yr(-1), (3) the number of detectable DDs (cooling time less than 10(8) yr) in our Galaxy is 3 million, and DDs with He WD primaries make up 56%, (4) the distribution of orbital periods of detectable DDs peaks around 6 hr, (5) WD 0957-666, 1101 + 364 and Feige 36 are formed by "stable RLOF plus CE", and WD 0135-052 is probably a carbon-oxygen WD pair rather than a helium WD pair, (6) mass transfer during stable RLOF is not conservative and 7) a tidally enhanced stellar wind exists.
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]	MASS-RATIO DISTRIBUTION ; DA-WHITE-DWARFS ; SPECTROSCOPIC BINARIES ; PLANETARY-NEBULAE ; CLOSE BINARIES ; DETACHED BINARY ; EVOLUTION ; STARS ; COMPONENTS ; SUPERNOVAE
收录类别	SCI
原文出处	http://www.sciencedirect.com/science/article/pii/S0275106299000302#
语种	英语
WOS记录号	WOS:000082340600013
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4390]
专题	云南天文台_大样本恒星演化研究组
通讯作者	Han, ZW
作者单位	1.Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011 ROC 2.Centre for Astrophysics, University of Sciences & Technology of China, Hefei 230026 ROC
推荐引用方式 GB/T 7714	Han ZW,Han, ZW. Channels for the formation of double degenerates and a Monte-Carlo analysis[J]. CHINESE ASTRONOMY AND ASTROPHYSICS,1999,23(1):75-88.
APA	Han ZW,&Han, ZW.(1999).Channels for the formation of double degenerates and a Monte-Carlo analysis.CHINESE ASTRONOMY AND ASTROPHYSICS,23(1),75-88.
MLA	Han ZW,et al."Channels for the formation of double degenerates and a Monte-Carlo analysis".CHINESE ASTRONOMY AND ASTROPHYSICS 23.1(1999):75-88.