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题名:
Frequency Identification and Asteroseismic Analysis of the Red Giant KIC 9145955: Fundamental Parameters and Helium Core Size
作者: Zhang XY(张昕旖)1,2,3; Wu T(吴涛)1,2,4; Li Y(李焱)1,2,3,4
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2018-03-01
卷号: 855, 期号:1
DOI: 10.3847/1538-4357/aaaabb
学科分类: 天文学
产权排序: 第1完成单位
收录类别: SCI
通讯作者: Zhang, Xinyi(Chinese Acad Sci, Yunnan Observ, 396 Yangfangwang, Kunming 650216, Yunnan, Peoples R China)
关键词: asteroseismology ; stars: individual (KIC 9145955) ; stars: oscillations (including pulsations)
英文摘要: We have analyzed 18 quarters of long-cadence data of KIC 9145955 provided by Kepler, and extracted 61 oscillation frequencies from these high-precision photometric data. The oscillation frequencies include 7 l= 0 modes, 44 l = 1 modes, 7 l= 2 modes, and 3 l = 3 modes. We identify l = 0 modes asp modes and l= 2 modes as p-dominated modes. For l = 1 modes, all of them are identified as mixed modes. These mixed modes can be used to determine the size of the helium core. We conduct a series of asteroseismic models and the size of the helium core is determined to be M-He = 0.210 +/- 0.002 M-circle dot and R-He = 0.0307 +/- 0.0002 R-circle dot. Furthermore, we find that only the acoustic radius tau(0) can be precisely determined with the asteroseismic method independently. The value of tau(0) is determined to be 0.494 +/- 0.001 days. By combining asteroseismic results and spectroscopic observations, we obtain the best-fitting model. The physical parameters of this model are M = 1.24 M-circle dot, Z = 0.009, alpha = 2.0, T-eff = 5069 K, log g = 3.029, R = 5.636 R-circle dot, and L = 18.759 L-circle dot. In addition, we think that the observed frequency F39 (96.397 mu Hz) is more appropriate to be identified as a mixed mode of the most p-dominated.
项目资助者: NSFC of China(11333006, 11521303, 11503076) ; foundation of Chinese Academy of Sciences(XDB09010202) ; Yunnan Applied Basic Research Projects(2017B008) ; NASAs Science Mission Directorate
语种: 英语
原文出处: 查看原文
ISSN号: 0004-637X
文章类型: Article
WOS标题词: Science & Technology ; Physical Sciences
研究领域[WOS]: Astronomy & Astrophysics
类目[WOS]: Astronomy & Astrophysics
关键词[WOS]: SOLAR-LIKE OSCILLATIONS ; KEPLER ; STARS ; MODES ; OPACITIES ; SUN ; AGE
WOS记录号: WOS:000426374700009
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ynao.ac.cn/handle/114a53/12135
Appears in Collections:恒星物理研究组_期刊论文
中国科学院天体结构与演化重点实验室_期刊论文

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作者单位: 1.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, People's Republic of China
2.Key Laboratory for Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, People's Republic of China
3.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
4.Center for Astronomical Mega-Science,Chinese Academy of Sciences, 20A Datun Road, Chaoyang District,Beijing 100012, People's Republic of China

Recommended Citation:
Zhang XY,Wu T,Li Y. Frequency Identification and Asteroseismic Analysis of the Red Giant KIC 9145955: Fundamental Parameters and Helium Core Size[J]. ASTROPHYSICAL JOURNAL,2018,855(1).
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文件名: Frequency Identification and Asteroseismic Analysis of the Red Giant KIC 9145955_ Fundamental Parameters and Helium Core Size.pdf
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