New Formation Channels of Hot Subdwarf Stars
文献类型：会议论文
| 作者 | Han ZW(韩占文) ; Chen XF(陈雪飞); Lei ZX(雷振新)
|
| 出版日期 | 2010 |
| 会议名称 | International Conference on Binaries: In Celebration of Ron Webbink's 65th Birthday |
| 会议日期 | 2010-06-22 |
| 会议地点 | Mykonos, GREECE |
| 关键词 | binaries: close subdwarfs white dwarfs |
| 卷号 | 1314 |
| 页码 | 85-90 |
| 通讯作者 | Han, ZW (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China. |
| 英文摘要 | Hot subdwarf stars, known as extreme horizontal branch stars in globular clusters, are important objects in many aspects, e.g., stellar evolution, distance indicators, Galactic Structure, and the long-standing problem of far-ultraviolet (far-UV) excess in early-type galaxies. In this talk, we review the current formation scenarios for hot subdwarf stars and discuss related problems, and then propose two new formation channels. The first channel is tidally enhanced stellar wind channel, in which a first giant branch (FGB) star experiences an enhanced stellar wind mass loss due to the proximity of its companion star and becomes a hot subdwarf if most of the envelope is lost. Such a channel can produce extreme horizontal branch stars, blue horizontal branch stars and red horizontal branch stars. The second channel is envelope ejection channel, in which a star ejects its envelope near the tip of FGB if the binding energy of the envelope becomes positive, and the remnant star becomes a hot subdwarf. Hot subdwarf stars may form in metal-rich old stellar populations from the envelope ejection channel and contribute to the far-UV excess in early-type galaxies. |
| 收录类别 | CPCI |
| 产权排序 | 第一完成单位 |
| 会议录 | AIP Conference Proceedings - INTERNATIONAL CONFERENCE ON BINARIES: IN CELEBRATION OF RON WEBBINK'S 65TH BIRTHDAY
 |
| 会议录出版者 | AMER INST PHYSICS |
| 学科主题 | Astronomy & Astrophysics |
| 会议录出版地 | 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA |
| 语种 | 英语 |
| ISSN号 | 0094-243X |
| ISBN号 | 978-0-7354-0869-2 |
| WOS记录号 | WOS:000287171500022 |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/248]  |
| 专题 | 云南天文台_大样本恒星演化研究组 云南天文台_中国科学院天体结构与演化重点实验室 |
| 作者单位 | Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, Kunming 650011, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Han ZW,Chen XF,Lei ZX. New Formation Channels of Hot Subdwarf Stars[C]. 见:International Conference on Binaries: In Celebration of Ron Webbink's 65th Birthday. Mykonos, GREECE. 2010-06-22. |
入库方式： OAI收割
来源：云南天文台
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