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Non-adiabatic oscillations of red giants
Xiong, D. R.; Deng, L.
2007-07-11
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
卷号378期号:4页码:1270-1282
摘要Using our non-local time-dependent theory of convection, the linear non-adiabatic oscillations of 10 evolutionary model series with masses of 1-3 M-circle dot are calculated. The results show that there is a red giant instability strip in the lower temperature side of the Hertzsprung-Russell diagram which goes along the sequences of the red giant branch and the asymptotic giant branch. For red giants of lower luminosities, pulsation instability is found at high order overtones; the lower order modes from the fundamental to the second overtone are stable. Towards higher luminosity and lower effective temperature, instability moves to lower order modes, and the amplitude growth rate of oscillations also grows. At the high luminosity end of the strip, the fundamental and the first overtone become unstable, while all the modes above the fourth order become stable. The excitation mechanisms have been studied in detail. It is found that turbulent pressure plays a key role for excitation of red variables. The frozen convection approximation is unavailable for the low temperature stars with extended convective envelopes. In any case, this approximation can explain neither the red edge of the Cepheid instability strip, nor the blue edge of the pulsating red giant instability strip. An analytic expression of a pulsation constant as a function of stellar mass, luminosity and effective temperature is presented from this work.
文章类型Article
关键词Convection Stars : Evolution Stars : Late-type Stars : Variables : Other
WOS标题词Science & Technology ; Physical Sciences
学科领域Astronomy & Astrophysics
DOI10.1111/j.1365-2966.2007.11642.x
关键词[WOS]GRAVITATIONAL LENSING EXPERIMENT ; INTRINSIC VARIABLE-STARS ; LARGE-MAGELLANIC-CLOUD ; LONG-PERIOD VARIABLES ; SMALL-AMPLITUDE ; PULSATIONAL STABILITY ; TURBULENT CONVECTION ; PHOTOMETRIC VARIABILITY ; NONLOCAL CONVECTION ; GALACTIC BULGE
收录类别SCI
语种英语
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000247667900006
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被引频次:36[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/11207
专题院士文集_熊大闰
作者单位1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
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Xiong, D. R.,Deng, L.. Non-adiabatic oscillations of red giants[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2007,378(4):1270-1282.
APA Xiong, D. R.,&Deng, L..(2007).Non-adiabatic oscillations of red giants.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,378(4),1270-1282.
MLA Xiong, D. R.,et al."Non-adiabatic oscillations of red giants".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 378.4(2007):1270-1282.
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