Impact of the Tayler magnetic instability on the surface abundance of boron in massive stars
文献类型：期刊论文
| 作者 | Asatiani, L.3; Eggenberger, P.3; Marchand, M.3; MOYANO FACUNDO DAVID2; Meynet, G.3; Choplin, A.1 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2025-07-11 |
| 卷号 | 699 |
| 关键词 | stars: abundances stars: magnetic field stars: massive stars: rotation |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202555163 |
| 产权排序 | 第2完成单位 |
| 文献子类 | Article |
| 英文摘要 | Context. The surface abundances of massive stars show evidence of internal mixing, while asteroseismic data suggest that efficient angular momentum (AM) transport occurs in stellar interiors. It is of interest to find a consistent physical framework that is able to account for both of these effects simultaneously. Aims. We investigate the impact of the Tayler magnetic instability on the surface abundance of boron in massive B-type stars as predicted by rotating stellar models accounting for the advective nature of meridional currents. Methods. We used the Geneva stellar evolution code (GENEC) to compute models of 9, 12, and 15 M-circle dot stars at different rotational velocities and with and without magnetic fields. We compared the surface boron abundances predicted by these models with those of observed B-type stars to test the consistency between AM transport constrained by asteroseismology and chemical mixing constrained by boron abundances. Results. We find that models with only hydrodynamic transport processes overestimate the amount of boron depletion for stars with high rotation rates, in disagreement with observational constraints. We show that this excessively high mixing efficiency is a direct consequence of the high degree of differential rotation predicted by purely hydrodynamic models. We thus conclude that, similarly to asteroseismic measurements, surface abundances of boron also indicate that a more efficient AM transport is needed in stellar radiative zones. We then studied the impact of the magnetic Tayler instability as a possible physical explanation to this issue. These magnetic models, which correctly reproduce asteroseismic constraints on AM transport, are found to be in good agreement with constraints on surface boron abundances, the evolutionary state, and the projected rotational velocity of moderately and fast-rotating B-type stars. We thus conclude that models accounting for the simultaneous impact of the magnetic Tayler instability and the advective nature of meridional currents offer a coherent and physically motivated theoretical framework that reproduces chemical mixing as revealed by boron abundances of fast-rotating stars and AM transport as constrained by asteroseismology. Finally, we note that at low rotational velocities (v sin i less than or similar to 50 km/s), models with magnetic fields do not predict sufficient depletion to be consistent with the observations, which are more compatible with non-magnetic models. This could suggest that the current prescriptions for transport by the Tayler instability somewhat overestimate the AM transport efficiency in slowly rotating B-type 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 TRANSPORT ; STELLAR EVOLUTION ; ROTATIONAL SPLITTINGS ; CONVECTIVE BOUNDARIES ; MAIN-SEQUENCE ; MODULES ; CIRCULATION ; DIFFUSION ; TURBULENCE ; CORE |
| 资助项目 | Schweizerischer Nationalfonds zur Frderung der Wissenschaftlichen Forschunghttps://doi.org/10.13039/501100001711; Foundation for Education and European Culture (IPEP)[219745]; SNF; Fonds de la Recherche Scientifique - FNRS |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001527131800013 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | Schweizerischer Nationalfonds zur Frderung der Wissenschaftlichen Forschunghttps://doi.org/10.13039/501100001711 ; Foundation for Education and European Culture (IPEP)[219745] ; SNF ; Fonds de la Recherche Scientifique - FNRS |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28435]  |
| 专题 | 云南天文台_大样本恒星演化研究组 |
| 通讯作者 | Asatiani, L. |
| 作者单位 | 1.Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, CP 226, B-1050 Brussels, Belgium 2.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China; 3.Département d’Astronomie, Université de Genève, Chemin Pegasi 51, 1290 Versoix, Switzerland; |
| 推荐引用方式 GB/T 7714 | Asatiani, L.,Eggenberger, P.,Marchand, M.,et al. Impact of the Tayler magnetic instability on the surface abundance of boron in massive stars[J]. ASTRONOMY & ASTROPHYSICS,2025,699. |
| APA | Asatiani, L.,Eggenberger, P.,Marchand, M.,MOYANO FACUNDO DAVID,Meynet, G.,&Choplin, A..(2025).Impact of the Tayler magnetic instability on the surface abundance of boron in massive stars.ASTRONOMY & ASTROPHYSICS,699. |
| MLA | Asatiani, L.,et al."Impact of the Tayler magnetic instability on the surface abundance of boron in massive stars".ASTRONOMY & ASTROPHYSICS 699(2025). |
入库方式： OAI收割
来源：云南天文台
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