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Solar-like and Mira-like oscillations of stars - A uniform excitation mechanism
Xiong, Da-Run1; Deng, Li-Cai2
2013-11-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN0035-8711
Volume13Issue:11Pages:1269-1294
Corresponding AuthorZhang, XG (通讯作者) Chinese Acad Sci, Purple Mt Observ, 2 Beijing XiLu, Nanjing 210008, Jiangsu, Peoples R China.
AbstractUsing a non-local and time-dependent theory of convection, we have calculated the linear non-adiabatic oscillations of the radial and low-degree F-p39 modes for evolutionary models from the main sequence to the asymptotic giant branch for stars with solar abundance (X = 0. 7 0, Z = 0. 0 2) in the mass range of 0.6-3.0 M circle dot. The results show that low luminosity cool stars tend to be solar-like oscillators, whose low-order modes are stable, but intermediate and high order p-modes are pulsationally unstable; their unstable modes have a wide range in frequency and small values for amplitude growth rates. For stars with increasing luminosity and therefore lower temperature, the unstable modes shift towards lower orders, the corresponding range of frequency decreases, and the amplitude growth rate increases. High luminosity red giant stars behave like typical Mira-like oscillators. The effects of the coupling between convection and oscillations on pulsational instability have been carefully analyzed in this work. Our research shows that convection does not simply act as a damping mechanism for oscillations, and the complex nature of the coupling between convection and oscillations makes turbulent convection sometimes behave as damping, and sometimes as excitation. Such a picture can not only naturally account for the red edge of the instability strip, but also the solar-like oscillations in low luminosity red stars and Mira-like ones in high luminosity red giants.
KeywordConvection Stars: Oscillations Stars: Late-type Stars: Evolution
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordMIXING-LENGTH THEORY ; RED GIANTS ; P-MODES ; STOCHASTIC EXCITATION ; NONADIABATIC OSCILLATIONS ; 5-MINUTE OSCILLATIONS ; TURBULENT CONVECTION ; NONLOCAL CONVECTION ; PULSATING STARS ; ACOUSTIC MODES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000326281500001
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9921
Collection南极天文中心
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Xiong, Da-Run,Deng, Li-Cai. Solar-like and Mira-like oscillations of stars - A uniform excitation mechanism[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2013,13(11):1269-1294.
APA Xiong, Da-Run,&Deng, Li-Cai.(2013).Solar-like and Mira-like oscillations of stars - A uniform excitation mechanism.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,13(11),1269-1294.
MLA Xiong, Da-Run,et al."Solar-like and Mira-like oscillations of stars - A uniform excitation mechanism".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 13.11(2013):1269-1294.
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