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A modest change in magnetic braking at the fully convective boundary explains the evolution of cataclysmic variables

文献类型：期刊论文

作者Barraza, Joaquín A.1,2; Schreiber, Matthias R.1; Littlefair, Stuart3; Belloni Diogo4; Schwope, Axel D.5
刊名ASTRONOMY & ASTROPHYSICS
出版日期2026-04-13
卷号708
关键词methods: numerical binaries: close stars: evolution white dwarfs
ISSN号0004-6361
DOI10.1051/0004-6361/202659326
产权排序第4完成单位
文献子类Article
英文摘要Context. For decades, reproducing the orbital period distribution of nonmagnetic cataclysmic variables (CVs) seemed to require a drastic decrease, usually termed disruption, in the angular momentum loss through magnetic braking at the fully convective boundary, which argued for a change in the dynamo mechanism operating in fully and partially convective stars. However, recent studies showed that the prescription for magnetic braking that is traditionally used in CV evolution theory is clearly outdated because saturation, that is, a weak period dependence for rapidly rotating stars, is not included. Aims. We test an updated version of a prescription for saturated magnetic braking that has been developed to explain the spin-down of single stars in the context of CV evolution. This prescription contains a boosting and a disruption parameter that represent the change in the strength of magnetic braking at the fully convective boundary. Methods. We performed dedicated MESA simulations for CVs with the revised prescription for saturated magnetic braking. Results. As in previous studies, we found that magnetic braking needs to be stronger in close binaries than in single stars, and that, in contrast to what is observed in single stars, magnetic braking needs to be reduced at the fully convective boundary. However, in contrast to previous studies of CV evolution, only a moderate disruption by a factor of 2-3 is sufficient to explain key features of the CV orbital period distribution and the measured mass-radius relation for CV donors. Conclusions. The relatively small decrease in the efficiency of magnetic braking at the fully convective boundary might have implications for our understanding of dynamo models for fully and partially convective stars.
学科主题天文学 ; 恒星与银河系
URL标识查看原文
出版地17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE
WOS关键词ANGULAR-MOMENTUM EVOLUTION ; COMMON ENVELOPE BINARIES ; MASS ; ROTATION ; STARS ; FORMULATION ; DEPENDENCE ; INSIGHTS ; MODULES ; RATES
资助项目[Schw536/37-1]
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001739495300001
出版者EDP SCIENCES S A
资助机构[Schw536/37-1]
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/29171]  
专题云南天文台_大样本恒星演化研究组
通讯作者Barraza, Joaquín A.
作者单位1.Universidad Técnica Federico Santa María (UTFSM), Department of Physics, Valparaíso, Chile;
2.Pontificia Universidad Católica de Valparaíso (PUCV), Institute of Physics, Valparaíso, Chile;
3.Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK;
4.International Centre of Supernovae (ICESUN), Yunnan Key Laboratory of Supernova Research, Yunnan Observatories, CAS, Kunming 650216, China;
5.Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany
推荐引用方式
GB/T 7714		 Barraza, Joaquín A.,Schreiber, Matthias R.,Littlefair, Stuart,et al. A modest change in magnetic braking at the fully convective boundary explains the evolution of cataclysmic variables[J]. ASTRONOMY & ASTROPHYSICS,2026,708.
APA Barraza, Joaquín A.,Schreiber, Matthias R.,Littlefair, Stuart,Belloni Diogo,&Schwope, Axel D..(2026).A modest change in magnetic braking at the fully convective boundary explains the evolution of cataclysmic variables.ASTRONOMY & ASTROPHYSICS,708.
MLA Barraza, Joaquín A.,et al."A modest change in magnetic braking at the fully convective boundary explains the evolution of cataclysmic variables".ASTRONOMY & ASTROPHYSICS 708(2026).

入库方式： OAI收割

来源：云南天文台

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