| The diffusive overshooting approach to Li abundance in clusters | |
Zhang QS(张钱生)1,2,3 ; Zhang, QS (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China.
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| 发表期刊 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 2012-12 | |
| 卷号 | 427期号:2页码:1441-1448 |
| DOI | 10.1111/j.1365-2966.2012.22065.x |
| 产权排序 | 第1完成单位 |
| 收录类别 | SCI |
| 关键词 | Convection Diffusion Stars: Abundances Open Clusters And Associations: Individual: Hyades Praesepe Ngc6633 Ngc3680 Ngc752 M67 |
| 摘要 | Helioseimic investigation shows that convective overshooting can penetrate 0.37H(P) to the location where the temperature is 2.5 x 10(6) K, which is the typical temperature of the reaction Li-7(p, alpha) He-4. This indicates that overshooting mixing should be involved in investigating the solar Li abundance problem. Observations of the Li abundance of solar twins show that the Sun is not very peculiar. Overshooting mixing should also be involved in investigating Li abundance in clusters. However, fully overshooting mixing with a length of 0.37H(P) results in too much Li depletion to fit the observations in the solar case. Therefore, using the diffusive process to describe the overshooting is more suitable. The diffusive overshooting approach requires the turbulent root-mean-square velocity in the overshooting region in order to calculate the diffusion coefficient. Turbulent convection models (TCMs), which are suggested by helioseimic investigation, can provide the turbulent properties in the overshooting region. However, TCMs are often too complex to be applied in calculations of stellar evolution. There is an easier way to use the asymptotic solution of TCMs. In this paper the asymptotic solution of Li & Yang's TCM, which results in agreement in both solar sound speed and solar Li abundance, is used to investigate the Li abundance in clusters (Hyades, Praesepe, NGC6633, NGC752, NGC3680 and M67). It is found that overshooting mixing leads to significant Li depletion in old clusters (t > 1Gyr) and has little effect in young clusters (t < 1Gyr). |
| 项目资助者 | National Natural Science Foundation of China [10673030, 10973035] ; Science Foundation of Yunnan Observatory, Yunnan Province [Y1ZX011007, 2010CD112] ; Chinese Academy of Sciences [KJCX2-YW-T24] |
| 语种 | 英语 |
| 学科领域 | Astronomy & Astrophysics |
| 文章类型 | Article |
| ISSN | 0035-8711 |
| URL | 查看原文 |
| WOS记录号 | WOS:000311413500045 |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 关键词[WOS] | SOLAR-TYPE STARS ; LOW-MASS STARS ; TURBULENT CONVECTION THEORY ; STELLAR EVOLUTION MODELS ; MAIN-SEQUENCE ; LITHIUM DEPLETION ; INTERMEDIATE-AGE ; INTERNAL WAVES ; NONLOCAL CONVECTION ; OPACITIES |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/5213 |
| 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 | Zhang, QS (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, POB 110, Kunming 650011, Peoples R China. |
| 作者单位 | 1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, PO Box 110, Kunming, 650011, China 2.Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming, 650011, China 3.Graduate School of Chinese Academy of Sciences, Beijing, 100039, 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 | Zhang QS,Zhang, QS . The diffusive overshooting approach to Li abundance in clusters[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,427(2):1441-1448. |
| APA | Zhang QS,&Zhang, QS .(2012).The diffusive overshooting approach to Li abundance in clusters.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,427(2),1441-1448. |
| MLA | Zhang QS,et al."The diffusive overshooting approach to Li abundance in clusters".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 427.2(2012):1441-1448. |
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| The diffusive oversh（1015KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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