CONVECTIVE OVERSHOOT MIXING IN MODELS OF THE STELLAR INTERIOR
文献类型：期刊论文
| 作者 | Zhang QS(张钱生)1,2,3
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| 刊名 | ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
 |
| 出版日期 | 2013-04 |
| 卷号 | 205期号:2页码:18-27 |
| ISSN号 | 0067-0049 |
| 关键词 | convection stars: abundances stars: interiors turbulence |
| 通讯作者 | Zhang, QS (reprint author), Chinese Acad Sci, Natl Astron Observ, Yunnan Observ, POB 110, Kunming 650011, Peoples R China. |
| 产权排序 | 第一完成单位 |
| 英文摘要 | Convective overshoot mixing plays an important role in stellar structure and evolution. However, overshoot mixing is also a long-standing problem; it is one of the most uncertain factors in stellar physics. As is well known, convective overshoot mixing is determined by the radial turbulent flux of the chemical component. In this paper, a local model of the radial turbulent flux of the chemical component is established based on hydrodynamic equations and some model assumptions and is tested in stellar models. The main conclusions are as follows. (1) The local model shows that convective overshoot mixing could be regarded as a diffusion process and the diffusion coefficient for different chemical elements is the same. However, if the non-local terms i.e., the gradient of the third-order moments, are taken into account, the diffusion coefficient for each chemical element should in general be different. (2) The diffusion coefficient of convective/overshoot mixing shows different behaviors in the convection zone and in the overshoot region because the characteristic length scale of the mixing is large in the convection zone and small in the overshoot region. Overshoot mixing should be regarded as a weak mixing process. (3) The diffusion coefficient of mixing is tested in stellar models, and it is found that a single choice of our central mixing parameter leads to consistent results for a solar convective envelope model as well as for core convection models of stars with masses from 2 M to 10 M. |
| 学科主题 | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | TURBULENT CONVECTION ; NONLOCAL CONVECTION ; MASSIVE STARS ; SOLAR MODELS ; ZONE ; EVOLUTION ; DIFFUSION ; TESTS ; SUN ; SIMULATION |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/article/10.1088/0067-0049/205/2/18/meta |
| 语种 | 英语 |
| WOS记录号 | WOS:000317037600008 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5233]  |
| 专题 | 云南天文台_恒星物理研究组 云南天文台_中国科学院天体结构与演化重点实验室 |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming 650011, China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China 3.Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
| 推荐引用方式 GB/T 7714 | Zhang QS. CONVECTIVE OVERSHOOT MIXING IN MODELS OF THE STELLAR INTERIOR[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2013,205(2):18-27. |
| APA | Zhang QS.(2013).CONVECTIVE OVERSHOOT MIXING IN MODELS OF THE STELLAR INTERIOR.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,205(2),18-27. |
| MLA | Zhang QS."CONVECTIVE OVERSHOOT MIXING IN MODELS OF THE STELLAR INTERIOR".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 205.2(2013):18-27. |
入库方式： OAI收割
来源：云南天文台
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