Avoided crossings between non-radial modes in low mass RGB stars
文献类型：期刊论文
| 作者 | Guo JJ(郭军军)1,2,3 ; Li Y(李焱)1,2; Lai XJ(赖祥军)1,2
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| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
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| 出版日期 | 2012-12 |
| 卷号 | 12期号:12页码:1655-1665 |
| 关键词 | stars: oscillations stars: red giants |
| ISSN号 | 1674-4527 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | Guo, JJ (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China. |
| 英文摘要 | Non-radial p modes and g modes appear simultaneously in red giant stars. Their frequencies have different variation rates, causing their frequencies to become close during stellar evolution so that avoided crossings appear. The separation between regions where acoustic waves and gravity waves propagate for l = 1, 2 and 3 is different, which results in the coupling efficiency also being different. We present the results of numerical computations of the models we study. We find that the two kinds of modes for l = 2 and 3 need to be closer in frequency in order for a complete exchange to occur, compared to the case for modes with l = 1. Their scaled oscillation frequencies also present better regularity with evolution than modes with l = 1. In order to study the effect of the avoided crossings in detail, we set the mode which has the smallest mode inertia to be the p mode. We plot the two kinds of modes for l = 1, 2 and 3 in frequency and period echelle diagrams and find modes of l = 2 and 3 fit the two relations better; they are more equally spaced in frequency and period than modes with l = 1. Under careful observation of the two kinds of echelle diagrams for l = 2 and 3, we still find that some p modes shift a little from being equally spaced in frequency and some g modes, which are close to those p modes in period, shift a little from being equally spaced in period. Then, we study the relation between the deviation from period being equally spaced and the mode inertia of g modes for different l. The g modes of l = 1 with a period closer to the p mode have less inertia and the deviation is bigger in the period echelle diagram. Their deviation is also obvious. However g modes of l = 2 and 3 shift a little or have almost no deviation from being equally spaced in period, even though some of them may have strong coupling and close mode inertia like in the p modes. So, we suggest a possible method for measuring period spacing of g modes precisely using mixed g modes with l = 2 and 3 that have fewer observed mixed g modes than for l = 1. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | SOLAR-LIKE OSCILLATIONS ; MAIN-SEQUENCE STARS ; RED GIANTS ; STELLAR OSCILLATIONS ; GRAVITY MODES ; KEPLER ; ASTEROSEISMOLOGY ; AMPLITUDES ; OPACITIES ; EQUATION |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/1674-4527/12/12/007/ |
| 语种 | 英语 |
| WOS记录号 | WOS:000313011000007 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5212]  |
| 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, 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 | Guo JJ,Li Y,Lai XJ. Avoided crossings between non-radial modes in low mass RGB stars[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2012,12(12):1655-1665. |
| APA | Guo JJ,Li Y,&Lai XJ.(2012).Avoided crossings between non-radial modes in low mass RGB stars.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,12(12),1655-1665. |
| MLA | Guo JJ,et al."Avoided crossings between non-radial modes in low mass RGB stars".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 12.12(2012):1655-1665. |
入库方式： OAI收割
来源：云南天文台
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