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Evolution of dipolar mixed-mode coupling factor in red giant stars: impact of buoyancy spike

文献类型:期刊论文

作者Jiang, C9; Cunha, M8; Christensen-Dalsgaard, J7; Zhang QS(张钱生)3,4,5,6; Gizon, L1,2,9
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2022-08-08
卷号515期号:3页码:3853-3866
ISSN号0035-8711
关键词stars: evolution stars: interiors stars: oscillations
DOI10.1093/mnras/stac2065
产权排序第4完成单位
文献子类Article
英文摘要

Mixed modes observed in red giants allow for investigation of the stellar interior structures. One important feature in these structures is the buoyancy spike caused by the discontinuity of the chemical gradient left behind during the first dredge-up. The buoyancy spike emerges at the base of the convective zone in low-luminosity red giants and later becomes a glitch when the g-mode cavity expands to encompass the spike. Here, we study the impact of the buoyancy spike on the dipolar mixed modes using stellar models with different properties. We find that the applicability of the asymptotic formalisms for the coupling factor, q, varies depending on the location of the evanescent zone, relative to the position of the spike. Significant deviations between the value of q inferred from fitting the oscillation frequencies and either of the formalisms proposed in the literature are found in models with a large frequency separation in the interval 5-15 mu Hz, with evanescent zones located in a transition region that may be thin or thick. However, it is still possible to reconcile q with the predictions from the asymptotic formalisms, by choosing which formalism to use according to the value of q. For stars approaching the luminosity bump, the buoyancy spike becomes a glitch and strongly affects the mode frequencies. Fitting the frequencies without accounting for the glitch leads to unphysical variations in the inferred q, but we show that this is corrected when properly accounting for the glitch in the fitting.

学科主题天文学 ; 恒星与银河系 ; 恒星形成与演化
URL标识查看原文
出版地GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
WOS关键词SOLAR-LIKE OSCILLATIONS ; PERIOD SPACINGS
资助项目Max Planck Society ; Fundacao para a Ciencia e a Tecnologia (FCT, Portugal)[CEECIND/02619/2017] ; Fundacao para a Ciencia e a Tecnologia (FCT, Portugal)[UIDB/04434/2020] ; Fundacao para a Ciencia e a Tecnologia (FCT, Portugal)[UIDP/04434/2020] ; Fundacao para a Ciencia e a Tecnologia (FCT, Portugal)[PTDC/FIS-AST/30389/2017] ; FEDER - Fundo Europeu de Desenvolvimento Regional through COMPETE2020 - Programa Operacional Competitividade e Internacionalizacao[POCI-01-0145-FEDER-030389] ; Danish National Research Foundation[DNRF106] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB 41000000] ; National Natural Science Foundation of China[11773064] ; foundation of Chinese Academy of Sciences (Light of West China Program) ; foundation of Chinese Academy of Sciences (Youth Innovation Promotion Association) ; Yunnan Ten Thousand Talents Plan Young & Elite Talents Project
WOS研究方向Astronomy & Astrophysics
语种英语
出版者OXFORD UNIV PRESS
WOS记录号WOS:000838819900018
资助机构Max Planck Society ; Fundacao para a Ciencia e a Tecnologia (FCT, Portugal)[CEECIND/02619/2017, UIDB/04434/2020, UIDP/04434/2020, PTDC/FIS-AST/30389/2017] ; FEDER - Fundo Europeu de Desenvolvimento Regional through COMPETE2020 - Programa Operacional Competitividade e Internacionalizacao[POCI-01-0145-FEDER-030389] ; Danish National Research Foundation[DNRF106] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB 41000000] ; National Natural Science Foundation of China[11773064] ; foundation of Chinese Academy of Sciences (Light of West China Program) ; foundation of Chinese Academy of Sciences (Youth Innovation Promotion Association) ; Yunnan Ten Thousand Talents Plan Young & Elite Talents Project
版本出版稿
源URL[http://ir.ynao.ac.cn/handle/114a53/25542]  
专题云南天文台_恒星物理研究组
云南天文台_中国科学院天体结构与演化重点实验室
通讯作者Jiang, C
作者单位1.Center for Space Science, NYUAD Institute, New York University Abu Dhabi, PO Box 129188, Saadiyat Island, Abu Dhabi, UAE
2.Institut für Astrophysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany;
3.University of Chinese Academy of Sciences, Beijing 100049, China;
4.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, China;
5.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China;
6.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming 650216, China;
7.Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark;
8.Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, P-4150-762 Porto, Portugal;
9.Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, D-37077 Göttingen, Germany;
推荐引用方式
GB/T 7714
Jiang, C,Cunha, M,Christensen-Dalsgaard, J,et al. Evolution of dipolar mixed-mode coupling factor in red giant stars: impact of buoyancy spike[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2022,515(3):3853-3866.
APA Jiang, C,Cunha, M,Christensen-Dalsgaard, J,Zhang QS,&Gizon, L.(2022).Evolution of dipolar mixed-mode coupling factor in red giant stars: impact of buoyancy spike.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,515(3),3853-3866.
MLA Jiang, C,et al."Evolution of dipolar mixed-mode coupling factor in red giant stars: impact of buoyancy spike".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 515.3(2022):3853-3866.

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来源:云南天文台

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