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Frequency Identification and Asteroseismic Analysis of the Red Giant KIC 9145955: Fundamental Parameters and Helium Core Size
Zhang XY(张昕旖)1,2,3; Wu T(吴涛)1,2,4; Li Y(李焱)1,2,3,4
发表期刊ASTROPHYSICAL JOURNAL
2018-03-01
卷号855期号:1
DOI10.3847/1538-4357/aaaabb
产权排序第1完成单位
收录类别SCI
关键词Asteroseismology Stars: Individual (Kic 9145955) Stars: Oscillations (Including Pulsations)
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.

资助项目NSFC of China[11333006] ; NSFC of China[11521303] ; NSFC of China[11503076] ; foundation of Chinese Academy of Sciences[XDB09010202] ; Yunnan Applied Basic Research Projects[2017B008] ; NASAs Science Mission Directorate
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
学科领域天文学 ; 恒星与银河系 ; 恒星物理学
学科门类理学 ; 理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS记录号WOS:000426374700009
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]SOLAR-LIKE OSCILLATIONS ; KEPLER ; STARS ; MODES ; OPACITIES ; SUN ; AGE
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/12135
专题恒星物理研究组
中国科学院天体结构与演化重点实验室
通讯作者Zhang XY(张昕旖)
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
推荐引用方式
GB/T 7714
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).
APA Zhang XY,Wu T,&Li Y.(2018).Frequency Identification and Asteroseismic Analysis of the Red Giant KIC 9145955: Fundamental Parameters and Helium Core Size.ASTROPHYSICAL JOURNAL,855(1).
MLA Zhang XY,et al."Frequency Identification and Asteroseismic Analysis of the Red Giant KIC 9145955: Fundamental Parameters and Helium Core Size".ASTROPHYSICAL JOURNAL 855.1(2018).
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