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 | |
刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
2018-08-01 | |
卷号 | 478期号:3页码:3290-3297 |
关键词 | Stars: Oscillation Subdwarfs |
ISSN号 | 0035-8711 |
DOI | 10.1093/mnras/sty1010 |
产权排序 | 第1完成单位 |
文献子类 | Article |
英文摘要 | 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. |
学科主题 | 天文学 |
URL标识 | 查看原文 |
资助项目 | NSFC of China[11333006] ; NSFC of China[11521303] ; foundation of Chinese Academy of Sciences[XDB09010202] |
WOS关键词 | Core Helium Flash ; Extremely Metal-poor ; Blue Hook Stars ; Compact Pulsators ; Omega-centauri ; Hydrodynamic Simulations ; Spectroscopic Analyses ; Multicolor Photometry ; Stellar Parameters ; Period Spacings |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | OXFORD UNIV PRESS |
WOS记录号 | WOS:000441282300032 |
资助机构 | NSFC of China[11333006, 11521303] ; foundation of Chinese Academy of Sciences[XDB09010202] |
内容类型 | 期刊论文 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/17826] |
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 | Guo JJ(郭军军); Li Y(李焱) |
作者单位 | 1.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 |
推荐引用方式 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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