Cataclysmic variables with evolved secondaries and the progenitors of AM CVn stars

doi:10.1046/j.1365-8711.2003.06380.x

YNAO OpenIR > 大样本恒星演化研究组

	Cataclysmic variables with evolved secondaries and the progenitors of AM CVn stars
	Podsiadlowski, P 1; Han ZW(韩占文)2 ; Rappaport, S 3; Podsiadlowski, P (reprint author), Univ Oxford, Dept Astrophys, Oxford OX1 3RH, England.
发表期刊	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2003-04-21
卷号	340 期号:4 页码:1214-1228
DOI	10.1046/j.1365-8711.2003.06380.x
产权排序	第2完成单位
收录类别	SCI
关键词	Gravitation Binaries : Close White Dwarfs Novae Cataclysmic Variables
摘要	We present the results of a systematic study of cataclysmic variables (CVs) and related systems, combining detailed binary-population synthesis (BPS) models with a grid of 120 binary evolution sequences calculated with a Henyey-type stellar evolution code. In these sequences, we used three masses for the white dwarf (0.6, 0.8 and 1.0 M-circle dot) and seven masses for the donor star in the range of 0.6-1.4 M-circle dot . The shortest orbital periods were chosen to have initially unevolved secondaries, and the longest orbital period for each secondary mass was taken to be just longer than the bifurcation period (16-22 h), beyond which systems evolve towards long orbital periods. These calculations show that systems that start with evolved secondaries near the end or just after their main-sequence phase become ultracompact systems with periods as short as similar to7 min. These systems are excellent candidates for AM Canum Venaticorum (AM CVn) stars. Using a standard BPS code, we show how the properties of CVs at the beginning of mass transfer depend on the efficiency for common-envelope (CE) ejection and the efficiency of magnetic braking. In our standard model, where CE ejection is efficient, some 10 per cent of all CVs have initially evolved secondaries (with a central hydrogen abundance X-c<0.4) and ultimately become ultracompact systems (implying a Galactic birth rate for AM CVn-like stars of similar to10(-3) yr(-1)). While these systems do not experience a period gap between 2 and 3 h, their presence in the gap does not destroy its distinct appearance. Almost all CVs with orbital periods longer than similar to5 h are found to have initially evolved or relatively massive secondaries. Based on a preliminary analysis, we find that their distribution of effective temperatures appears to be in reasonably good agreement with the distribution of spectral types obtained by Beuermann et al.
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	0035-8711
URL	查看原文
WOS记录号	WOS:000182118200016
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	DOUBLE WHITE-DWARFS ; X-RAY BINARIES ; LOW-MASS STARS ; POPULATION SYNTHESIS ; GRAVITATIONAL-RADIATION ; CANUM-VENATICORUM ; DETACHED SYSTEMS ; MAGNETIC BRAKING ; ACCRETION DISK ; PERIOD GAP
引用统计	被引频次：159[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/114a53/4404
专题	大样本恒星演化研究组
通讯作者	Podsiadlowski, P (reprint author), Univ Oxford, Dept Astrophys, Oxford OX1 3RH, England.
作者单位	1.University of Oxford, Department of Astrophysics, Oxford OX1 3RH 2.Yunnan Observatory, National Astronomical Observatories, The Chinese Academy of Sciences, Kunming 650011, China 3.Department of Physics and Centre for Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
推荐引用方式 GB/T 7714	Podsiadlowski, P,Han ZW,Rappaport, S,et al. Cataclysmic variables with evolved secondaries and the progenitors of AM CVn stars[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2003,340(4):1214-1228.
APA	Podsiadlowski, P,Han ZW,Rappaport, S,&Podsiadlowski, P .(2003).Cataclysmic variables with evolved secondaries and the progenitors of AM CVn stars.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,340(4),1214-1228.
MLA	Podsiadlowski, P,et al."Cataclysmic variables with evolved secondaries and the progenitors of AM CVn stars".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 340.4(2003):1214-1228.

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