Characteristics of convection and overshooting in RGB and AGB stars

doi:10.1088/1674-4527/11/10/003

YNAO OpenIR > 恒星物理研究组

	Characteristics of convection and overshooting in RGB and AGB stars
	Lai XJ(赖祥军)1,2,3 ; Li Y(李焱)1,2 ; Lai, XJ (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
发表期刊	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2011-10
卷号	11 期号:10 页码:1143-1157
DOI	10.1088/1674-4527/11/10/003
产权排序	第1完成单位
收录类别	SCI
关键词	Stars: Rgb And Agb Convection Of Stars Turbulent Convection Model: Convective Overshooting
摘要	Based on the turbulent convection model (TCM) of Li & Yang, we have studied the characteristics of turbulent convection in the envelopes of 2 and 5M(circle dot) stars at the red giant branch and asymptotic giant branch phases. The TCM has been successfully applied over the entire convective envelopes, including the convective unstable zone and the overshooting regions. We find that the convective motions become progressively stronger when the stellar models are located farther up along the Hayashi line. In the convective unstable zone, we find that the turbulent correlations are proportional to functions of a common factor (del - del(ad))(T) over bar, which explains similar distributions in those correlations. For the TCM we find that if the obtained stellar temperature structure is close to that of the mixing length theory (MLT), the convective motion will have a much larger velocity and thus be more violent. However, if the turbulent velocity is adjusted to be close to that of the MLT, the superadiabatic convection zone would be much more extended inward, which would lead to a lower effective temperature of the stellar model. For the overshooting distance, we find that the e-folding lengths of the turbulent kinetic energy k in both the top and bottom overshooting regions decrease as the stellar model is progressively located farther up along the Hayashi line, but both the extents of the decrease are not obvious. The overshooting distances of the turbulent correlation (u(T)'T') over bar are almost the same for the different stellar models with the same set of TCM parameters. For the decay modes of the kinetic energy k, we find that they are very similar for different stellar models based on the same set of TCM parameters, and there is a nearly linear relationship between lg k and In P for different stellar models. When C-s or alpha increases while the other parameters are fixed, the obtained linearly decaying distance will become longer.
项目资助者	National Natural Science Foundation of China [10973035, 10673030] ; Chinese Academy of Sciences [KJCX2-YW-T24]
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	1674-4527
URL	查看原文
归档日期	2011-12-16
WOS记录号	WOS:000296127800003
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	STELLAR TURBULENT CONVECTION ; REYNOLDS STRESS APPROACH ; HORIZONTAL-BRANCH STARS ; MIXING-LENGTH THEORY ; RED GIANT BRANCH ; SOLAR MODELS ; LOW-MASS ; INTERMEDIATE-MASS ; EVOLUTION ; NUCLEOSYNTHESIS
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/5206
专题	恒星物理研究组中国科学院天体结构与演化重点实验室
通讯作者	Lai, XJ (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinse Academy of Sciences, Kunming 650011, China 3.Graduate University of Chinese Academy of Sciences, Beijing 100049, China
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Lai XJ,Li Y,Lai, XJ . Characteristics of convection and overshooting in RGB and AGB stars[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2011,11(10):1143-1157.
APA	Lai XJ,Li Y,&Lai, XJ .(2011).Characteristics of convection and overshooting in RGB and AGB stars.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,11(10),1143-1157.
MLA	Lai XJ,et al."Characteristics of convection and overshooting in RGB and AGB stars".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 11.10(2011):1143-1157.

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