The Impact of Diffusion and Turbulent Mixing on Chemical Abundance Variations in the Open Cluster NGC 2420
文献类型：期刊论文
| 作者 | Guo, Fei2; Li XF(李雪峰)3; Li Y(李焱)1,3,4,5 |
| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2026-02-20 |
| 卷号 | 998期号:2 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ae3daf |
| 产权排序 | 第2完成单位 |
| 文献子类 | Article |
| 英文摘要 | The mixing of material in stellar envelopes critically determines surface elemental abundances. A well-established tension remains between theoretical models and observational data for stars near the main-sequence turn-off. Resolving this issue requires developing a more physically complete treatment of material mixing, likely arising from processes inadequately represented in standard stellar models. This paper discusses four mixing mechanisms, including convection, convective overshooting, radiative diffusivity, and atomic diffusion, with particular focus on their combined impact on the surface elemental abundances of stars in the open cluster NGC 2420 during stellar evolution. We find that changes in the surface elemental abundances depend on the initial mass of the star and its evolutionary stage. The addition of extra mixing (radiative diffusivity) can resolve the issue of pure hydrogen atmospheres that arises for stars with masses greater than 1.35 M circle dot. Our best-fitting model (Con+Ov+Diff) with a moderate overshoot parameter fov similar to 0.0174 reproduces the observed abundance dip in NGC 2420, confirming atomic diffusion as the key mechanism and supporting a cluster age of similar to 2.5 Gyr. |
| 学科主题 | 天文学 ; 恒星与银河系 |
| URL标识 | 查看原文 |
| 出版地 | No.2 The Distillery, Glassfields, Avon Street, Bristol, ENGLAND |
| WOS关键词 | RED GIANT STARS ; ATOMIC DIFFUSION ; CONVECTIVE BOUNDARIES ; ELEMENT DIFFUSION ; MAIN-SEQUENCE ; MODULES ; EVOLUTION ; SUBGIANT ; ROTATION ; TURNOFF |
| 资助项目 | Yunnan Province Foundation[202301AU070160] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001694241500001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | Yunnan Province Foundation[202301AU070160] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28929]  |
| 专题 | 云南天文台_恒星物理研究组 |
| 通讯作者 | Guo, Fei |
| 作者单位 | 1.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China 2.Yunnan Normal University, Kunming 650500, People’s Republic of China; guofei@ynnu.edu.cn; 3.Yunnan Observatories, Chinese Academy of Sciences, P.O.Box110, Kunming 650216, People’s Republic of China; 4.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China; 5.Key Laboratory for Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, P.O.Box110, Kunming 650216, People’s Republic of China; |
| 推荐引用方式 GB/T 7714 | Guo, Fei,Li XF,Li Y. The Impact of Diffusion and Turbulent Mixing on Chemical Abundance Variations in the Open Cluster NGC 2420[J]. ASTROPHYSICAL JOURNAL,2026,998(2). |
| APA | Guo, Fei,李雪峰,&李焱.(2026).The Impact of Diffusion and Turbulent Mixing on Chemical Abundance Variations in the Open Cluster NGC 2420.ASTROPHYSICAL JOURNAL,998(2). |
| MLA | Guo, Fei,et al."The Impact of Diffusion and Turbulent Mixing on Chemical Abundance Variations in the Open Cluster NGC 2420".ASTROPHYSICAL JOURNAL 998.2(2026). |
入库方式： OAI收割
来源：云南天文台
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