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题名: An anisotropic nonlocal convection theory
作者: Deng, L; Xiong DaRun(熊大闰); Chan, KL
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2006-05-20
卷号: 643, 期号:1, 页码:426-437
关键词: convection ; stars : evolution
学科分类: Astronomy & Astrophysics
文章类型: Article
英文摘要: We present in this paper an anisotropic nonlocal theory of stellar convection. Following the idea of Rotta, we propose that the correlation of turbulent pressure and velocity gradient tends to make the turbulent velocity isotropic, and we further introduce a convection parameter c(3) to measure the strength of such isotropization. By using such a theory, the structure of the solar convection zone is calculated. Our calculation shows that the radial component dominates in the convectively unstable zone, in which the ratio between the radial component and the horizontal component is w(r)(2)/w(h)(2) = ( 3 + c(3))/2c(3). In the upper overshooting zone, turbulent velocity is almost isotropic ( w(r)(2)/w(h)(2) similar to 0.5) and is independent of c(3), while in the lower overshooting zone, w(r)(2)/w(h)(2) similar to 0.5, and it tends to decrease as c(3) decreases. We also studied the effects of anisotropic convection on the structure and evolution of stars. It is shown that the anisotropy hardly affects the temperature and pressure structure of stars. However, the anisotropy increases with the decrease of c(3); therefore, the effect of overshooting decreases. Thus, the effects of anisotropy of turbulent convection on stellar evolution cannot be neglected.
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 ; OVERSHOOTING ZONE ; SOLAR PHOTOSPHERE ; HEIGHT DEPENDENCE ; MASSIVE STARS ; MIXING-LENGTH ; ATMOSPHERE ; VELOCITY ; OSCILLATIONS ; SIMULATIONS
收录类别: SCI
语种: 英语
WOS记录号: WOS:000237624900040
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/11203
Appears in Collections:熊大闰_期刊论文

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作者单位: 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
3.Hong Kong Univ Sci & Technol, Dept Math, Kowloon, Hong Kong, Peoples R China

Recommended Citation:
Deng L; Xiong DR; Chan KL.An anisotropic nonlocal convection theory ,ASTROPHYSICAL JOURNAL  ,2006,643(1):426-437
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