A possible formation channel for blue hook stars in globular clusters
文献类型：期刊论文
| 作者 | Lei, ZX1,2 ; Chen, XM3; Zhang FH(张奉辉)2,4; Han ZW(韩占文)2,4
|
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2015-05-21 |
| 卷号 | 449期号:3页码:2741-2749 |
| 关键词 | binaries: general stars: horizontal branch globular clusters: individual: NGC 2808 |
| ISSN号 | 0035-8711 |
| 产权排序 | 第四完成单位 |
| 通讯作者 | Lei, ZX (reprint author), Shaoyang Univ, Dept Sci, Shaoyang 422000, Peoples R China. |
| 英文摘要 | The formation mechanism for blue hook (BHk) stars in globular clusters (GCs) is still unclear. Following one of the possible scenarios, called the late hot flash scenario, we propose that a tidally enhanced stellar wind in binary evolution might provide the huge mass loss on the red giant branch (RGB) and produce BHk stars. Employing the detailed stellar evolution code MESA (Modules for Experiments in Stellar Astrophysics), we have investigated the contributions of tidally enhanced stellar wind as a possible formation channel for BHk stars in GCs. We evolved the primary stars with different initial orbital periods using the binary module in MESA (version 6208) from the zero-age main-sequence (ZAMS) to the post-horizontal branch (HB) stage, and obtained their evolution parameters, which are compared with the observation. The results are consistent with observations in the colour-magnitude diagram and the log g-T-eff plane for NGC 2808, which is an example GC hosting BHk stars. However, the helium abundance in the surface for our models is higher than the one obtained in BHk stars. This discrepancy between our models and observations is possibly due to the fact that gravitational settling and radiative levitation, which are common processes in hot HB stars, are not considered in the models as well as the fact that the flash mixing efficiency might be overestimated in the calculations. Our results suggest that tidally enhanced stellar wind in binary evolution is able to naturally provide the huge mass loss on the RGB needed for the late hot flash scenario, and it is a possible and reasonable formation channel for BHk stars in GCs. |
| 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] | HORIZONTAL-BRANCH STARS ; ENHANCED STELLAR WIND ; DWARF COOLING CURVE ; COLOR-MAGNITUDE DIAGRAMS ; HOT FLASHER SCENARIO ; NA-O ANTICORRELATION ; CLOSE BINARY STARS ; SUBDWARF-B-STARS ; OMEGA-CENTAURI ; MULTIPLE POPULATIONS |
| 收录类别 | SCI |
| 原文出处 | http://mnras.oxfordjournals.org/content/449/3/2741 |
| 语种 | 英语 |
| WOS记录号 | WOS:000355337800043 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/4595]  |
| 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 | 1.1Department of Science, Shaoyang University, Shaoyang 422000, China 2.Key Laboratory for the Structure, and Evolution of Celestial Objects, Chinese Academy of Sciences,Kunming 650011,China 3.Department of Electrical Engineering, Shaoyang University, Shaoyang 422000, China 4.Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China |
| 推荐引用方式 GB/T 7714 | Lei, ZX,Chen, XM,Zhang FH,et al. A possible formation channel for blue hook stars in globular clusters[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,449(3):2741-2749. |
| APA | Lei, ZX,Chen, XM,Zhang FH,&Han ZW.(2015).A possible formation channel for blue hook stars in globular clusters.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,449(3),2741-2749. |
| MLA | Lei, ZX,et al."A possible formation channel for blue hook stars in globular clusters".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 449.3(2015):2741-2749. |
入库方式： OAI收割
来源：云南天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。