The Evolution of Massive Close Binaries: Anomalous Relationship between Nitrogen Abundances and Rotational Velocities
Song, Hanfeng1,2,3; Wang, Jiangtao4; Song, Fen3,5; Zhang, Ruiyu6; Li, Zhi1; Peng, Weiguo1; Zhan, Qiong1; Jing, Jianghong1; Song, Hanfeng, Email: hfsong@gzu.edu.cn; Wang, Jiangtao, Email: wangjt@mail.bnu.edu.cn
发表期刊ASTROPHYSICAL JOURNAL
2018-05-20
卷号859期号:1
DOI10.3847/1538-4357/aabfda
收录类别SCI
关键词Binaries: Close Stars: Abundances Stars: Evolution Stars: Massive Stars: Rotation
摘要The combined effects of rotation and mass accretion on the evolution of binary systems are investigated in this work. Rotational binaries provide us with a promising channel that could explain the abnormal phenomenon of the nitrogen abundances in Groups 1 and 2 of the Galactic Hunter diagram. Group 1 contains fast-rotating but nitrogen-unenriched stars, whereas Group 2 includes apparently slowly rotating but nitrogen-enhanced stars. The donor star suffers from heavy mass loss that progressively exposes deep layers of nitrogen and corresponding angular momentum loss that can efficiently spin the star down. Rapid-rotation stars without nitrogen enrichment may be related to mass gainers that had accreted little matter from a close companion and then been spun up to rapid rotation. Nitrogen enrichment of mass gainers can be greatly suppressed by low accreting efficiency, which is induced by critical rotation, thermohaline mixing, and the gradient of mean molecular weight. Nitrogen enrichment due to mass accretion appears to be more efficient than that due to rotational mixing, because there exist thermohaline instabilities during Roche lobe overflow. The mixing in the enlarged convective core reduces carbon and nitrogen abundances but increases oxygen abundances in mass gainers. This process significantly triggers CNO cycling but does not support CN cycling. The orbital separation can be widened because of the nonconservative mass transfer, and this process gives rise to weak tidal torques. Therefore, invoking binaries has the potential to simultaneously explain the observed stars in Groups 1 and 2 of the Galactic Hunter diagram.
项目资助者National Natural Science Foundation of China(11463002, 11373020, 11603009) ; Natural Science Foundation of Fujian Province(2016J05013, 2018J05006) ; Open Foundation of the Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Science(OP201405, OP201404(B615015)) ; Science Foundation of Jimei University(C613030)
语种英语
学科领域天文学
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000432981500003
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]GAMMA-RAY BURSTS ; PRESUPERNOVA EVOLUTION ; THERMOHALINE CONVECTION ; STELLAR EVOLUTION ; STAR PROGENITORS ; MERGER RATES ; CIRCULATION ; TURBULENCE ; TRANSPORT ; MODELS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/12389
专题中国科学院天体结构与演化重点实验室
通讯作者Song, Hanfeng, Email: hfsong@gzu.edu.cn; Wang, Jiangtao, Email: wangjt@mail.bnu.edu.cn
作者单位1.College of Physics, Guizhou University, Guiyang, Guizhou Province, 550025, People's Republic of China
2.Geneva Observatory, Geneva University, CH-1290 Sauverny, Switzerland
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, People's Republic of China
4.Department of Astronomy, Beijing Normal University, 100875, Beijing, People's Republic of China
5.College of Science, Jimei University, Xiamen City, 361021 Fujian Province, People's Republic of China
6.Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai City, 200030, People's Republic of China
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Song, Hanfeng,Wang, Jiangtao,Song, Fen,et al. The Evolution of Massive Close Binaries: Anomalous Relationship between Nitrogen Abundances and Rotational Velocities[J]. ASTROPHYSICAL JOURNAL,2018,859(1).
APA Song, Hanfeng.,Wang, Jiangtao.,Song, Fen.,Zhang, Ruiyu.,Li, Zhi.,...&Wang, Jiangtao, Email: wangjt@mail.bnu.edu.cn.(2018).The Evolution of Massive Close Binaries: Anomalous Relationship between Nitrogen Abundances and Rotational Velocities.ASTROPHYSICAL JOURNAL,859(1).
MLA Song, Hanfeng,et al."The Evolution of Massive Close Binaries: Anomalous Relationship between Nitrogen Abundances and Rotational Velocities".ASTROPHYSICAL JOURNAL 859.1(2018).
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