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Close binary evolution II. Impact of tides, wind magnetic braking, and internal angular momentum transport
Song, H. F.1,2,3; Meynet, G.2; Maeder, A.2; Ekstrom, S.2; Eggenberger, P.2; Georgy, C.2; Qin, Y.2,4; Fragos, T.2; Soerensen, M.2; Barblan, F.2; Wade, G. A.5
Source PublicationASTRONOMY & ASTROPHYSICS
2018
Volume609
DOI10.1051/0004-6361/201731073
Indexed BySCI ; EI
KeywordStars: Mass-loss Stars: Abundances Binaries: Close Stars: Magnetic Field Stars: Evolution Stars: Rotation
Abstract

Context. Massive stars with solar metallicity lose important amounts of rotational angular momentum through their winds. When a magnetic field is present at the surface of a star, efficient angular momentum losses can still be achieved even when the mass-loss rate is very modest, at lower metallicities, or for lower-initial-mass stars. In a close binary system, the effect of wind magnetic braking also interacts with the influence of tides, resulting in a complex evolution of rotation. 

Aims. We study the interactions between the process of wind magnetic braking and tides in close binary systems. 

Methods. We discuss the evolution of a 10 M-circle dot star in a close binary system with a 7 M-circle dot companion using the Geneva stellar evolution code. The initial orbital period is 1.2 days. The 10 M-circle dot star has a surface magnetic field of 1 kG. Various initial rotations are considered. We use two different approaches for the internal angular momentum transport. In one of them, angular momentum is transported by shear and meridional currents. In the other, a strong internal magnetic field imposes nearly perfect solid-body rotation. The evolution of the primary is computed until the first mass-transfer episode occurs. The cases of different values for the magnetic fields and for various orbital periods and mass ratios are briefly discussed. 

Results. We show that, independently of the initial rotation rate of the primary and the efficiency of the internal angular momentum transport, the surface rotation of the primary will converge, in a time that is short with respect to the main-sequence lifetime, towards a slowly evolving velocity that is different from the synchronization velocity. This "equilibrium angular velocity" is always inferior to the angular orbital velocity. In a given close binary system at this equilibrium stage, the difference between the spin and the orbital angular velocities becomes larger when the mass losses and/or the surface magnetic field increase. The treatment of the internal angular momentum transport has a strong impact on the evolutionary tracks in the Hertzsprung-Russell Diagram as well as on the changes of the surface abundances resulting from rotational mixing. Our modelling suggests that the presence of an undetected close companion might explain rapidly rotating stars with strong surface magnetic fields, having ages well above the magnetic braking timescale. Our models predict that the rotation of most stars of this type increases as a function of time, except for a first initial phase in spin-down systems. The measure of their surface abundances, together, when possible, with their mass-luminosity ratio, provide interesting constraints on the transport efficiencies of angular momentum and chemical species. 

Conclusions. Close binaries, when studied at phases predating any mass transfer, are key objects to probe the physics of rotation and magnetic fields in stars.

Funding ProjectSwiss National Science Foundation[200020-172505] ; Swiss National Science Foundation[PZ00P2-148123] ; National Natural Science Foundation of China([11463002] ; Open Foundation of key Laboratory for the Structure and evolution of Celestial Objects, Chinese Academy of Science[OP201405] ; Natural Sciences and Engineering Research Council (NSERC) of Canada
Funding OrganizationSwiss National Science Foundation[200020-172505, PZ00P2-148123] ; National Natural Science Foundation of China([11463002] ; Open Foundation of key Laboratory for the Structure and evolution of Celestial Objects, Chinese Academy of Science[OP201405] ; Natural Sciences and Engineering Research Council (NSERC) of Canada
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星物理学 ; 恒星形成与演化
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherEDP SCIENCES S A
Publication Place17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
ISSN0004-6361
URL查看原文
WOS IDWOS:000418963900003
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordDRIVEN STELLAR WINDS ; MASSIVE STARS ; MERIDIONAL CIRCULATION ; DIFFERENTIAL ROTATION ; DYNAMICAL SIMULATIONS ; BLACK-HOLES ; SYSTEMS
EI Accession Number20180204618358
EI KeywordsStars
EI Classification Number471.4Seawater, Tides and Waves - 631.1Fluid Flow, General - 641.3Mass Transfer - 657.2Extraterrestrial Physics and Stellar Phenomena - 701.1Electricity: Basic Concepts and Phenomena - 913.1Production Engineering - 932High Energy Physics ; Nuclear Physics ; Plasma Physics
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12088
Collection中国科学院天体结构与演化重点实验室
Corresponding AuthorMeynet, G.
Affiliation1.College of Physics, Guizhou University, Guiyang City, Guizhou Province, 550025, P.R. 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
4.Guangxi Key Laboratory for Relativistic Astrophysics, Department of Physics, Guangxi University, Nanning 530004, China
5.Department of Physics, Royal Military College of Canada, Ontario, Canada
Recommended Citation
GB/T 7714
Song, H. F.,Meynet, G.,Maeder, A.,et al. Close binary evolution II. Impact of tides, wind magnetic braking, and internal angular momentum transport[J]. ASTRONOMY & ASTROPHYSICS,2018,609.
APA Song, H. F..,Meynet, G..,Maeder, A..,Ekstrom, S..,Eggenberger, P..,...&Wade, G. A..(2018).Close binary evolution II. Impact of tides, wind magnetic braking, and internal angular momentum transport.ASTRONOMY & ASTROPHYSICS,609.
MLA Song, H. F.,et al."Close binary evolution II. Impact of tides, wind magnetic braking, and internal angular momentum transport".ASTRONOMY & ASTROPHYSICS 609(2018).
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