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Influence of the He-flash convective overshoot on mode trapping efficiency in g-mode pulsating subdwarf B stars
Guo JJ(郭军军)1,2,3; Li Y(李焱)1,2,3,4
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2018-08-01
Volume478Issue:3Pages:3290-3297
DOI10.1093/mnras/sty1010
Contribution Rank第1完成单位
Indexed BySCI
KeywordStars: Oscillation Subdwarfs
Abstract

Recent detections of g-mode pulsations in subdwarf B (sdB) stars from the space missions CoRoT and Kepler have verified that nearly all of these pulsators have regular period spacings. This discovery has been extensively applied to mode identification for the observed g-mode sdB pulsators. However, the discovery of regular period spacings apparently contradicts the strong g-mode trapping structure expected in canonical sdB models, which is caused by steep chemical gradients in such evolved stars. Although the mode trapping efficiency could be reduced somewhat by taking into account the diffusion effect during the sdB phase, it is still difficult to explain the regular period spacings of g-mode sdB pulsators, especially in the short-period range. We suggest that the regular period spacings may arise earlier in the evolution of sdB stars rather than during the sdB stage itself. As for a canonical sdB star, it is evolved from a low-mass star and is considered to have gone through the He flash. The He flash causes extensive and aggressive convection that extends very close to the He/H transition zone. When considering a proper convective overshoot during the He-flash stage, the chemical profile in the He/H transition zone becomes smoother. Detailed model calculations show that the mode trapping efficiency could be reduced to approximately the level of observations throughout the observed period range by taking the He-flash overshoot into account.

Funding ProjectNSFC of China[11333006] ; NSFC of China[11521303] ; foundation of Chinese Academy of Sciences[XDB09010202]
Funding OrganizationNSFC of China[11333006, 11521303] ; foundation of Chinese Academy of Sciences[XDB09010202]
Language英语
Subject Area天文学
MOST Discipline Catalogue理学 ; 理学::天文学
SubtypeArticle
PublisherOXFORD UNIV PRESS
ISSN0035-8711
URL查看原文
WOS IDWOS:000441282300032
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordCore Helium Flash ; Extremely Metal-poor ; Blue Hook Stars ; Compact Pulsators ; Omega-centauri ; Hydrodynamic Simulations ; Spectroscopic Analyses ; Multicolor Photometry ; Stellar Parameters ; Period Spacings
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/17827
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 AuthorGuo JJ(郭军军); Li Y(李焱)
Affiliation1.Yunnan Observatories, Chinese Academy of Sciences, PO Box 110, Kunming 650011, China
2.Key Laboratory for Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, PO Box 110, Kunming 650011, 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
Guo JJ,Li Y. Influence of the He-flash convective overshoot on mode trapping efficiency in g-mode pulsating subdwarf B stars[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,478(3):3290-3297.
APA Guo JJ,&Li Y.(2018).Influence of the He-flash convective overshoot on mode trapping efficiency in g-mode pulsating subdwarf B stars.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,478(3),3290-3297.
MLA Guo JJ,et al."Influence of the He-flash convective overshoot on mode trapping efficiency in g-mode pulsating subdwarf B stars".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 478.3(2018):3290-3297.
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