Exploring the sources of p-mode frequency shifts in the CoRoT target HD 49933
文献类型：期刊论文
| 作者 | Liu, Zhi-E1; Bi, Shao-Lan1; Yang, Wu-Ming1; Li, Tan-Da2 ; Liu, Kang1; Tian, Zhi-Jia1; Ge, Zhi-Shuai1; Yu, Jie1; Li Tanda
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| 刊名 | RESEARCH IN ASTRONOMY AND ASTROPHYSICS
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| 出版日期 | 2014-06-01 |
| 卷号 | 14期号:6页码:683-692 |
| 关键词 | stars: individual (HD 49933) stars: evolution stars: oscillation stars: modeling |
| 英文摘要 | Oscillations of the solar-like star HD 49933 have been thoroughly observed by CoRot. Two dozen frequency shifts, which are closely related to the change in magnetic activity, have been measured. To explore the effects of magnetic activity on frequency shifts, we calculate frequency shifts for the radial and l = 1 p-modes of HD 49933 with the general variational method, which evaluates the shifts using a spatial integral of the product of a kernel and some sources. The theoretical frequency shifts reproduce the observation well. The magnitudes and positions of the sources are determined according to a chi(2) criterion. We predict the source that contributes to both the l = 0 and l = 1 modes is located 0.48 - 0.62 Mm below the surface of the star. In addition, based on the assumption that A(0) is proportional to the change in the MgII activity index Delta i(MgII), we obtain that the change in MgII index between the minimum and maximum of the cycle during the period of HD 49933 is about 0.665. The magnitude of the frequency shifts compared to the Sun already demonstrates that HD 49933 is much more active than the Sun, which is further confirmed in this paper. Furthermore, our calculation of the frequency shifts for l = 1 modes indicates the variation of turbulent velocity in the stellar convective zone may be an important source for the l = 1 shifts. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000337717100007 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6561]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 作者单位 | 1.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Zhi-E,Bi, Shao-Lan,Yang, Wu-Ming,et al. Exploring the sources of p-mode frequency shifts in the CoRoT target HD 49933[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2014,14(6):683-692. |
| APA | Liu, Zhi-E.,Bi, Shao-Lan.,Yang, Wu-Ming.,Li, Tan-Da.,Liu, Kang.,...&Li Tanda.(2014).Exploring the sources of p-mode frequency shifts in the CoRoT target HD 49933.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,14(6),683-692. |
| MLA | Liu, Zhi-E,et al."Exploring the sources of p-mode frequency shifts in the CoRoT target HD 49933".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 14.6(2014):683-692. |
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来源：国家天文台
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