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A possible formation channel for blue hook stars in globular clusters
Lei, ZX1,2; Chen, XM3; Zhang FH(张奉辉)2,4; Han ZW(韩占文)2,4
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2015-05-21
卷号449期号:3页码:2741-2749
DOI10.1093/mnras/stv544
产权排序第4完成单位
收录类别SCI ; EI
关键词Binaries: General Stars: Horizontal Branch Globular Clusters: Individual: Ngc 2808
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.

资助项目Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Science[OP201302] ; Natural Science Foundation of China[11390374] ; Science and Technology Innovation Talent Programme of the Yunnan Province[2013HA005] ; Chinese Academy of Sciences[XDB09010202]
项目资助者Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Science[OP201302] ; Natural Science Foundation of China[11390374] ; Science and Technology Innovation Talent Programme of the Yunnan Province[2013HA005] ; Chinese Academy of Sciences[XDB09010202]
语种英语
学科领域天文学 ; 恒星与银河系 ; 恒星形成与演化
文章类型Article
出版者OXFORD UNIV PRESS
出版地GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0035-8711
URL查看原文
WOS记录号WOS:000355337800043
WOS研究方向Astronomy & Astrophysics
WOS类目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
EI入藏号20221612002292
EI主题词Astrophysics
EI分类号657.2 Extraterrestrial Physics and Stellar Phenomena
引用统计
被引频次:23[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/114a53/4595
专题大样本恒星演化研究组
中国科学院天体结构与演化重点实验室
通讯作者Lei, ZX
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
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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.
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