Massive star evolution in close binaries Conditions for homogeneous chemical evolution
Song, H. F.1,3; Meynet, G.2; Maeder, A.2; Ekstroem, S.2; Eggenberger, P.2
发表期刊ASTRONOMY & ASTROPHYSICS
2016
卷号585
DOI10.1051/0004-6361/201526074
收录类别SCI ; EI
关键词Binaries: General Stars: Rotation Binaries: Close Stars: Magnetic Field Stars: Abundances Stars: Wolf-rayet
摘要

Aims. We investigate the impact of tidal interactions, before any mass transfer, on various properties of the stellar models. We study the conditions for obtaining homogeneous evolution triggered by tidal interactions, and for avoiding any Roche lobe overflow (RLOF) during the main-sequence phase. By homogeneous evolution, we mean stars evolving with a nearly uniform chemical composition from the centre to the surface. 

Methods. We consider the case of rotating stars computed with a strong core-envelope coupling mediated by an interior magnetic field. Models with initial masses between 15 and 60 M-circle dot, for metallicities between 0.002 and 0.014 and with initial rotation equal to 30% and 66% the critical rotation on the zero age main sequence, are computed for single stars and for stars in close binary systems. We consider close binary systems with initial orbital periods equal to 1.4, 1.6, and 1.8 days and a mass ratio equal to 3/2. 

Results. In models without any tidal interaction (single stars and wide binaries), homogeneous evolution in solid body rotating models is obtained when two conditions are realised: the initial rotation must be high enough, and the loss of angular momentum by stellar winds should be modest. This last point favours metal-poor fast rotating stars. In models with tidal interactions, homogeneous evolution is obtained when rotation imposed by synchronisation is high enough (typically a time-averaged surface velocities during the main-sequence phase above 250 km s(-1)), whatever the mass losses. We present plots that indicate for which masses of the primary and for which initial periods the conditions for the homogenous evolution and avoidance of the RLOF are met, for various initial metallicities and rotations. In close binaries, mixing is stronger at higher than at lower metallicities. Homogeneous evolution is thus favoured at higher metallicities. RLOF avoidance is favoured at lower metallicities because stars with less metals remain more compact. We also study the impact of different processes for the angular momentum transport on the surface abundances and velocities in single and close binaries. In models where strong internal coupling is assumed, strong surface enrichments are always associated with high surface velocities in binary or single star models. In contrast, models computed with mild coupling may produce strong surface enrichments associated with low surface velocities. This observable difference can be used to probe different models for the transport of the angular momentum in stars. Homogeneous evolution is more easily obtained in models (with or without tidal interactions) with solid body rotation. 

Conclusions. Close binary models help us to understand homogeneous massive stars, fast rotating Wolf-Rayet stars, and progenitors of long soft gamma-ray bursts, even at high metallicities.

资助项目National Natural Science Foundation of China[11463002] ; Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences[OP201405] ; Swiss National Science Foundation[200020-146401]
项目资助者National Natural Science Foundation of China[11463002] ; Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences[OP201405] ; Swiss National Science Foundation[200020-146401]
语种英语
学科领域天文学 ; 恒星与银河系 ; 恒星物理学 ; 恒星形成与演化
学科门类理学 ; 理学::天文学
文章类型Article
出版者EDP SCIENCES S A
出版地17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
ISSN0004-6361
URL查看原文
WOS记录号WOS:000369710300127
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]M-CIRCLE-DOT ; STELLAR EVOLUTION ; GLOBULAR-CLUSTERS ; DYNAMO ACTION ; MODELS ; ROTATION ; POPULATIONS ; GRIDS ; BLUE
EI入藏号20160401843430
EI主题词Metals
EI分类号641.3Mass Transfer - 657.2Extraterrestrial Physics and Stellar Phenomena - 701.2Magnetism: Basic Concepts and Phenomena - 931.3Atomic and Molecular Physics
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9340
专题中国科学院天体结构与演化重点实验室
通讯作者Meynet, G.
作者单位1.College of Science, Guizhou University, Guiyang, 550025 Guizhou Province PR China
2.Geneva Observatory, Geneva University, 1290 Sauverny, Switzerland
3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650011 Kunming, PR China
推荐引用方式
GB/T 7714
Song, H. F.,Meynet, G.,Maeder, A.,et al. Massive star evolution in close binaries Conditions for homogeneous chemical evolution[J]. ASTRONOMY & ASTROPHYSICS,2016,585.
APA Song, H. F.,Meynet, G.,Maeder, A.,Ekstroem, S.,&Eggenberger, P..(2016).Massive star evolution in close binaries Conditions for homogeneous chemical evolution.ASTRONOMY & ASTROPHYSICS,585.
MLA Song, H. F.,et al."Massive star evolution in close binaries Conditions for homogeneous chemical evolution".ASTRONOMY & ASTROPHYSICS 585(2016).
条目包含的文件
文件名称/大小 文献类型 版本类型 开放类型 使用许可
Massive star evoluti(2227KB)期刊论文出版稿开放获取CC BY-NC-SA浏览 请求全文
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
谷歌学术
谷歌学术中相似的文章
[Song, H. F.]的文章
[Meynet, G.]的文章
[Maeder, A.]的文章
百度学术
百度学术中相似的文章
[Song, H. F.]的文章
[Meynet, G.]的文章
[Maeder, A.]的文章
必应学术
必应学术中相似的文章
[Song, H. F.]的文章
[Meynet, G.]的文章
[Maeder, A.]的文章
相关权益政策
暂无数据
收藏/分享
文件名: Massive star evolution in close binaries.pdf
格式: Adobe PDF
所有评论 (0)
暂无评论
 

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。