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Cataclysmic variables with evolved secondaries and the progenitors of AM CVn stars
文献类型：期刊论文
| 作者 | Podsiadlowski, P1; Han ZW(韩占文)2 ; Rappaport, S3
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2003-04-21 |
| 卷号 | 340期号:4页码:1214-1228 |
| 关键词 | gravitation binaries : close novae, cataclysmic variables white dwarfs |
| ISSN号 | 0035-8711 |
| 产权排序 | 第二完成单位 |
| 通讯作者 | Podsiadlowski, P (reprint author), Univ Oxford, Dept Astrophys, Oxford OX1 3RH, England. |
| 英文摘要 | 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. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | 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 |
| 收录类别 | SCI |
| 原文出处 | http://mnras.oxfordjournals.org/content/340/4/1214 |
| 语种 | 英语 |
| WOS记录号 | WOS:000182118200016 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/4404]  |
| 专题 | 云南天文台_大样本恒星演化研究组 |
| 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. 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.(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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来源：云南天文台
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