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题名: The beta Cephei instability strip
作者: Deng, L; Xiong DaRun(熊大闰)
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2001-11-01
卷号: 327, 期号:3, 页码:881-887
关键词: stars : early-type ; Hertzsprung-Russell (HR) diagram ; stars : oscillations ; stars : variables : other
学科分类: Astronomy & Astrophysics
文章类型: Article
英文摘要: We carried out a series of linear stability analyses of the radial and low-degree non-radial p modes for stellar models with initial masses of 6-30 M-circle dot. The stellar models were computed by using convective overshoot distance d(over) = 0.10, 0.25 and 0.40 H-p. Our numerical results show that the beta Cephei instability strip forms a horn-shaped region pointing upwards near the main sequence on the Hertzsprung-Russell diagram (HRD). The lower part of the instability strip for the radial modes join the zero-age main-sequence (ZAMS) at M approximate to 8.0-10.5 M-circle dot, while the top of the instability strip extends up to M approximate to 15.5 M-circle dot. The instability strip for the non-radial modes is even wider. The overall instability strip is dominated by the radial and non-radial fundamental modes. The first overtone (the radial-order index n=1) is also pulsationally unstable. We have shown that the beta Cephei stability is almost independent of the overshoot parameter d(over) used for the stellar models, while it depends critically on the metal abundance. With decreasing metal abundance, the instability region shrinks and eventually disappears for Z less than or similar to 0.005.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: B-TYPE STARS ; STELLAR ENVELOPES ; PULSATIONAL STABILITY ; TURBULENT CONVECTION ; VARIABLE-STARS ; OSCILLATIONS ; OPACITIES ; EQUATION ; STATE ; MODELS
收录类别: SCI
语种: 英语
WOS记录号: WOS:000172046700018
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/11189
Appears in Collections:熊大闰_期刊论文

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作者单位: 1.Chinese Acad Sci, Beijing Astron Observ, Beijing 100101, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China

Recommended Citation:
Deng, L; Xiong, DR.The beta Cephei instability strip,MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2001,327(3):881—887
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