The intermediate neutron capture process: VI. Proton ingestion and i-process in rotating magnetic asymptotic giant branch stars
文献类型：期刊论文
| 作者 | Choplin, A.2,3; Siess, L.2,3; Goriely, S.2,3; Eggenberger, P.4; MOYANO FACUNDO DAVID1 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2026-01-30 |
| 卷号 | 706 |
| 关键词 | asteroseismology nuclear reactions nucleosynthesis abundances stars: AGB and post-AGB stars: interiors stars: magnetic field stars: rotation |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202557649 |
| 产权排序 | 第4完成单位 |
| 文献子类 | Article |
| 英文摘要 | Context. The intermediate neutron-capture process (i-process) can occur during proton ingestion events (PIEs), which may take place in the early evolutionary phases of asymptotic giant branch (AGB) stars. Aims. We investigate the impact of rotational and magnetic mixing on i-process nucleosynthesis in low-metallicity, low-mass AGB stars. Methods. We computed AGB models with [Fe/H] = -2.5 and -1.7 and initial masses of 1 and 1.5 M-circle dot using the STAREVOL code, including a network of 1160 nuclei coupled to transport equations. Rotating models incorporate a calibrated Tayler-Spruit (TS) dynamo to account for core rotation rates inferred from asteroseismic observations of solar-metallicity sub-giants and giants. Initial rotation velocities of 0, 30, and 90 km s(-1) were considered, along with varying assumptions for magnetic mixing. Results. Rotation without magnetic fields strongly suppresses the i-process due to the production of primary N-14, which is subsequently converted into Ne-22 - a potent neutron poison during the PIE. Including magnetic fields via the TS dynamo restores the models close to their non-rotating counterparts: strong core-envelope coupling suppresses shear mixing and prevents primary N-14 synthesis, yielding i-process nucleosynthesis similar to non-rotating models. We also find that rotational mixing during the AGB phase is insufficient to affect the occurrence of PIEs. Conclusions. Proton ingestion event-driven nucleosynthesis proceeds similarly in asteroseismic-calibrated magnetic rotating AGB stars and non-rotating stars, producing identical abundance patterns. |
| 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 ; S-PROCESS NUCLEOSYNTHESIS ; PRE-MAIN-SEQUENCE ; LOW-MASS ; RED GIANTS ; AGB STARS ; INTERNAL TRANSPORT ; CORE ROTATION ; EVOLVED STARS ; MIXED-MODES |
| 资助项目 | Fonds de la Recherche Scientifique-FNRS[IISN 4.4502.19]; SNF[219745] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001676218900011 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | Fonds de la Recherche Scientifique-FNRS[IISN 4.4502.19] ; SNF[219745] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28888]  |
| 专题 | 云南天文台_大样本恒星演化研究组 |
| 通讯作者 | Choplin, A. |
| 作者单位 | 1.Yunnan Observatories, Chinese Academy of Sciences Kunming 650216, China 2.Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, CP 226 B-1050 Brussels, Belgium; 3.BLU-ULB, Brussels Laboratory of the Universe, blu.ulb.be Brussels, Belgium; 4.Département d’Astronomie, Université de Genève Chemin Pegasi 51 1290 Versoix, Switzerland; |
| 推荐引用方式 GB/T 7714 | Choplin, A.,Siess, L.,Goriely, S.,et al. The intermediate neutron capture process: VI. Proton ingestion and i-process in rotating magnetic asymptotic giant branch stars[J]. ASTRONOMY & ASTROPHYSICS,2026,706. |
| APA | Choplin, A.,Siess, L.,Goriely, S.,Eggenberger, P.,&MOYANO FACUNDO DAVID.(2026).The intermediate neutron capture process: VI. Proton ingestion and i-process in rotating magnetic asymptotic giant branch stars.ASTRONOMY & ASTROPHYSICS,706. |
| MLA | Choplin, A.,et al."The intermediate neutron capture process: VI. Proton ingestion and i-process in rotating magnetic asymptotic giant branch stars".ASTRONOMY & ASTROPHYSICS 706(2026). |
入库方式： OAI收割
来源：云南天文台
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