NAOC Open IR  > 光学天文研究部
Non-adiabatic oscillations of red giants
Xiong, D. R.; Deng, L.
AbstractUsing 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.
KeywordConvection Stars : Evolution Stars : Late-type Stars : Variables : Other
Indexed BySCI
WOS IDWOS:000247667900006
Citation statistics
Cited Times:37[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
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.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Xiong, D. R.]'s Articles
[Deng, L.]'s Articles
Baidu academic
Similar articles in Baidu academic
[Xiong, D. R.]'s Articles
[Deng, L.]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Xiong, D. R.]'s Articles
[Deng, L.]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.