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Determining the size of the helium core of KIC 9970396 using asteroseismology: a red giant approaching the red giant bump
Zhang XY(张昕旖)1,2,3; Li Y(李焱)1,2,3,4; Wu T(吴涛)1,2,4; Su J(苏杰)1,2,4
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2020-05-01
Volume494Issue:1Pages:511-528
DOI10.1093/mnras/staa667
Contribution Rank第1完成单位
Indexed BySCI
Keywordstars: individual: KIC 9970396 stars: oscillations stars: solar-type
Abstract

Mixed modes are less affected by the surface effect and carry internal information of a star. Asteroseismic modelling of mixed modes can constrain the size of the helium core of a star. Previous work has shown that the evolution stage of KIC 9970396 may be near the red giant bump phase, which is one of the most interesting regions in the red giant evolution stage. It is known that there is a clear relation between the core and mass luminosity, following homological principles on the low-luminosity giant branch. Our aim in this paper is to determine the size of the helium core and constrain the internal structure of the star. Our approach is first to identify the most p-dominated frequencies in the observational mixed modes. The calculated frequencies are then fitted to the observational frequencies, which we choose not to correct for surface effect offsets. We have computed a grid of theoretical models to fit the l = 1 modes of KIC 9970396. The size of the helium core of KIC 9970396 is determined to be M-He = 0.229 +/- 0.001 M-circle dot and R-He = 0.03055 +/- 0.00015 R-circle dot. The best-fitting model shows that KIC 9970396 is undergoing a stage that is between the first dredge-up event and the red giant bump. Compared with the results of our model, the previous core-mass luminosity relation overestimates the helium core mass by 0.009 M-circle dot when the stellar luminosity of a red giant star is known.

Funding ProjectNational Science Foundation of China[11333006] ; National Science Foundation of China[11521303] ; National Science Foundation of China[11873084] ; National Science Foundation of China[11773064] ; National Science Foundation of China[11833006] ; Yunnan Applied Basic Research Projects[2017B008] ; West Light Foundation of the Chinese Academy of Sciences - NASA Science Mission Directorate
Funding OrganizationNational Science Foundation of China[11333006, 11521303, 11873084, 11773064, 11833006] ; Yunnan Applied Basic Research Projects[2017B008] ; West Light Foundation of the Chinese Academy of Sciences - NASA 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
PublisherOXFORD UNIV PRESS
Publication PlaceGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
ISSN0035-8711
URL查看原文
WOS IDWOS:000535885900040
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordDATA RELEASE ; STARS ; MASS ; EVOLUTION ; RADIUS ; AGE
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/23373
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); Li Y(李焱)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, P. R. China
2.Key Laboratory for Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Zhang XY,Li Y,Wu T,et al. Determining the size of the helium core of KIC 9970396 using asteroseismology: a red giant approaching the red giant bump[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,494(1):511-528.
APA Zhang XY,Li Y,Wu T,&Su J.(2020).Determining the size of the helium core of KIC 9970396 using asteroseismology: a red giant approaching the red giant bump.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,494(1),511-528.
MLA Zhang XY,et al."Determining the size of the helium core of KIC 9970396 using asteroseismology: a red giant approaching the red giant bump".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 494.1(2020):511-528.
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