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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
Source PublicationASTROPHYSICAL JOURNAL
2018-03-01
Volume855Issue:1
DOI10.3847/1538-4357/aaaabb
Contribution Rank第1完成单位
Indexed BySCI
KeywordAsteroseismology Stars: Individual (Kic 9145955) Stars: Oscillations (Including Pulsations)
Abstract

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.

Funding ProjectNSFC 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
Funding OrganizationNSFC of China[11333006, 11521303, 11503076] ; foundation of Chinese Academy of Sciences[XDB09010202] ; Yunnan Applied Basic Research Projects[2017B008] ; NASAs Science Mission Directorate
Language英语
Subject Area天文学 ; 恒星与银河系 ; 恒星物理学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherIOP PUBLISHING LTD
Publication PlaceTEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS IDWOS:000426374700009
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordSOLAR-LIKE OSCILLATIONS ; KEPLER ; STARS ; MODES ; OPACITIES ; SUN ; AGE
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12135
Collection恒星物理研究组
中国科学院天体结构与演化重点实验室
Corresponding AuthorZhang XY(张昕旖)
Affiliation1.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
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
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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