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A Study of Wolf-Rayet Stars Formed VIA Chemically Homogeneous Evolution
Cui,Zhe1; Wang,Zhaojun1; Zhu,Chunhua1; Lü,Guoliang1; Chen HL(陈海亮)2; Han ZW(韩占文)2
发表期刊Publications of the Astronomical Society of the Pacific
2018-08
卷号130期号:990
DOI10.1088/1538-3873/aac55e
产权排序第2完成单位
收录类别SCI
关键词stars: evolution stars: rotation stars: Wolf–Rayet
摘要

Abstract Using the stellar evolution code—Modules for Experiments in Stellar Astrophysics (MESA)—we investigate the evolution of massive stars with different rotational velocities and metallicities towards Wolf-Rayet stars. In our simulations, the initial rotating velocities are taken as 0, 250, 500, and 650 km s?1, and the metallicities equal to 0.02, 0.014, 0.008, 0.006, 0.004, and 0.002. We show our rapid rotation models in the HR diagram compared with the observations. We find that the rotational mixing is less efficient at high metallicity, and these stars become Wolf-Rayet (WR) stars when the helium in their center is ignited. However, rapid rotating massive stars at low metallicity can easily evolve into WR stars due to the rotation resulted in chemically homogeneous evolution. This can explain the origin of single WR stars in galaxy at low metallicity. In our models, the observed SMC WR stars are consistent with the single-star evolution models. However, at higher metallicities our single-star evolution models can only explain the luminous, hydrogen-rich WN stars and O stars (which are classified as WR stars previously).

资助项目National Natural Science Foundation of China[11473024] ; National Natural Science Foundation of China[11363005] ; National Natural Science Foundation of China[11763007] ; National Natural Science Foundation of China[11503008] ; National Natural Science Foundation of China[11365022] ; National Natural Science Foundation of China[11703081] ; National Natural Science Foundation of China[11521303] ; National Natural Science Foundation of China[11733008] ; XinJiang Science Fund for Distinguished Young Scholars[QN2016YX0049] ; National Natural Science Foundation of Yunnan Province[2017HC018] ; CAS light of West China Program
项目资助者National Natural Science Foundation of China[11473024, 11363005, 11763007, 11503008, 11365022, 11703081, 11521303, 11733008] ; XinJiang Science Fund for Distinguished Young Scholars[QN2016YX0049] ; National Natural Science Foundation of Yunnan Province[2017HC018] ; CAS light of West China Program
语种英语
学科领域天文学 ; 恒星与银河系
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-6280
URL查看原文
WOS记录号WOS:000436594900002
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]MASS-LOSS RATES ; LARGE-MAGELLANIC-CLOUD ; RADIATION-DRIVEN WINDS ; GALACTIC WN STARS ; STELLAR EVOLUTION ; SPECTRAL-ANALYSES ; ANGULAR-MOMENTUM ; METALLICITY DEPENDENCE ; ROTATING STARS ; SINGLE STAR
引用统计
被引频次:1[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/114a53/18650
专题大样本恒星演化研究组
通讯作者Cui,Zhe
作者单位1.School of Physical Science and Technology, Xinjiang University, Urumqi, 830046, People's Republic of China
2.Yunnan Observatories, the Chinese Academy of Sciences, Kunming 650011, People's Republic of China
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GB/T 7714
Cui,Zhe,Wang,Zhaojun,Zhu,Chunhua,et al. A Study of Wolf-Rayet Stars Formed VIA Chemically Homogeneous Evolution[J]. Publications of the Astronomical Society of the Pacific,2018,130(990).
APA Cui,Zhe,Wang,Zhaojun,Zhu,Chunhua,Lü,Guoliang,Chen HL,&Han ZW.(2018).A Study of Wolf-Rayet Stars Formed VIA Chemically Homogeneous Evolution.Publications of the Astronomical Society of the Pacific,130(990).
MLA Cui,Zhe,et al."A Study of Wolf-Rayet Stars Formed VIA Chemically Homogeneous Evolution".Publications of the Astronomical Society of the Pacific 130.990(2018).
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