Exploring the Small-scale Magnetic Fields in the Atmosphere of HD 49385 by Asteroseismic Analysis

doi:10.3847/1538-4357/ad71c7

YNAO OpenIR > 恒星物理研究组

	Exploring the Small-scale Magnetic Fields in the Atmosphere of HD 49385 by Asteroseismic Analysis
	Wang YT(王悦同)1,2,3 ; Li, Yaguang 4; Li Y(李焱)1,2,3,5 ; Lin GF(林桂芳)2,3 ; Wu T(吴涛)2,3,5
发表期刊	ASTROPHYSICAL JOURNAL
	2024-09-01
卷号	973 期号:1
DOI	10.3847/1538-4357/ad71c7
产权排序	第2完成单位
收录类别	SCI
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.
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
项目资助者	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
语种	英语
学科领域	天文学 ; 恒星与银河系
文章类型	Article
出版者	IOP Publishing Ltd
出版地	TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN	0004-637X
URL	查看原文
WOS记录号	WOS:001314687700001
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	ANGULAR-MOMENTUM TRANSPORT ; OSCILLATION FREQUENCIES ; SOLAR-TYPE ; FUNDAMENTAL PARAMETERS ; CONVECTIVE BOUNDARIES ; NUMERICAL SIMULATIONS ; RED GIANTS ; KEPLER ; STARS ; MODULES
引用统计
文献类型	期刊论文
版本	出版稿
条目标识符	http://ir.ynao.ac.cn/handle/114a53/27615
专题	恒星物理研究组
作者单位	1.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China; [email protected]; 2.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People's Republic of China; 3.International Center of Supernovae at the Yunnan Key Laboratory, Kunming 650216, People's Republic of China; 4.Institute for Astronomy, University of Hawai'i, 2680 Woodlawn Drive, Honolulu, HI 96822, USA; 5.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012, People's Republic of 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	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).

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