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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
DOI10.1088/1674-4527/11/10/003
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
ISSN1674-4527
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
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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
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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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