Exploring the Small-scale Magnetic Fields in the Atmosphere of HD 49385 by Asteroseismic Analysis
文献类型：期刊论文
| 作者 | Wang YT(王悦同)3,4,5 ; Li, Yaguang2; Li Y(李焱)1,3,4,5; Lin GF(林桂芳)3,4; Wu T(吴涛)1,3,4
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| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2024-09-01 |
| 卷号 | 973期号:1 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ad71c7 |
| 产权排序 | 第2完成单位 |
| 文献子类 | Article |
| 英文摘要 | Recent asteroseismic studies have shown convincing evidence that magnetic fields may exist in the interior of some pulsating red giants. Inspired by this breakthrough, we explored the effect of small-scale magnetic fields on the p-mode oscillations in an evolved star, HD 49385. We incorporate a modified Eddington T-tau equation that phenomenologically mimics the effect of the magnetic fields in the atmosphere of HD 49385, and calculate the frequencies of p-modes with l = 0, 1, and 2. By comparing the calculated frequencies with the observed ones, we select two best-fit models with either GS98 or A09 chemical composition. Our best-fit models not only fit satisfactorily the observed frequencies but also well reproduce some spectroscopically observed stellar parameters such as effective temperature and log g. Based on the two best-fit models, we have estimated that the small-scale magnetic fields possess a strength of approximately 80 G and spread concentratively at approximately a height of 1850 km in the atmosphere. By selecting the best-fit models with a special requirement on the avoided-crossing mode, we have confirmed that the frequency of the avoided-crossing mode is tightly related to the helium core of the star, and determined the size of the helium core as 0.117 M (circle dot) in mass and 0.078 R (circle dot) in radius. Based on the improvements of the previous two sides, we can accurately determine the mass of HD 49385 to be 1.25 +/- 0.02 M- circle dot with an age of 4.1 Gyr for GS98 composition and 4.5 Gyr for A09 composition. |
| 学科主题 | 天文学 ; 恒星与银河系 |
| URL标识 | 查看原文 |
| 出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
| WOS关键词 | ANGULAR-MOMENTUM TRANSPORT ; OSCILLATION FREQUENCIES ; SOLAR-TYPE ; FUNDAMENTAL PARAMETERS ; CONVECTIVE BOUNDARIES ; NUMERICAL SIMULATIONS ; RED GIANTS ; KEPLER ; STARS ; MODULES |
| 资助项目 | National Natural Science Foundation of China[12288102]; National Natural Science Foundation of China[12133011]; National Natural Science Foundation of China[12273104]; National Key R&D Program of China[2021YFA1600400/2021YFA1600402]; International Center of Supernovae at the Yunnan Key Laboratory[202302AN360001]; B-type Strategic Priority Program of Chinese Academy of Sciences[XDB41000000]; Yunnan Fundamental Research Projects[202401AS070045]; Youth Innovation Promotion Association of Chinese Academy of Sciences; Yunnan Ten Thousand Talents Plan Young & Elite Talents Project |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001314687700001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | National Natural Science Foundation of China[12288102, 12133011, 12273104] ; National Key R&D Program of China[2021YFA1600400/2021YFA1600402] ; International Center of Supernovae at the Yunnan Key Laboratory[202302AN360001] ; B-type Strategic Priority Program of Chinese Academy of Sciences[XDB41000000] ; Yunnan Fundamental Research Projects[202401AS070045] ; Youth Innovation Promotion Association of Chinese Academy of Sciences ; Yunnan Ten Thousand Talents Plan Young & Elite Talents Project |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/27615]  |
| 专题 | 云南天文台_恒星物理研究组 |
| 作者单位 | 1.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012, People's Republic of China 2.Institute for Astronomy, University of Hawai'i, 2680 Woodlawn Drive, Honolulu, HI 96822, USA; 3.International Center of Supernovae at the Yunnan Key Laboratory, Kunming 650216, People's Republic of China; 4.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People's Republic of China; 5.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China; ly@ynao.ac.cn; |
| 推荐引用方式 GB/T 7714 | Wang YT,Li, Yaguang,Li Y,et al. Exploring the Small-scale Magnetic Fields in the Atmosphere of HD 49385 by Asteroseismic Analysis[J]. ASTROPHYSICAL JOURNAL,2024,973(1). |
| APA | 王悦同,Li, Yaguang,李焱,林桂芳,&吴涛.(2024).Exploring the Small-scale Magnetic Fields in the Atmosphere of HD 49385 by Asteroseismic Analysis.ASTROPHYSICAL JOURNAL,973(1). |
| MLA | 王悦同,et al."Exploring the Small-scale Magnetic Fields in the Atmosphere of HD 49385 by Asteroseismic Analysis".ASTROPHYSICAL JOURNAL 973.1(2024). |
入库方式： OAI收割
来源：云南天文台
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