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Turbulent convection and pulsation stability of stars - II. Theoretical instability strip for delta Scuti and gamma Doradus stars
Xiong, D. R.1; Deng, L.2; Zhang, C.2; Wang, K.2
2016-04-11
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume457Issue:3Pages:3163-3177
AbstractBy using a non-local and time-dependent convection theory, we have calculated radial and low-degree non-radial oscillations for stellar evolutionary models with M = 1.4-3.0 M-circle dot. The results of our study predict theoretical instability strips for delta Scuti and gamma Doradus stars, which overlap with each other. The strip of gamma Doradus is slightly redder in colour than that of delta Scuti. We have paid great attention to the excitation and stabilization mechanisms for these two types of oscillations, and we conclude that radiative K mechanism plays a major role in the excitation of warm delta Scuti and gamma Doradus stars, while the coupling between convection and oscillations is responsible for excitation and stabilization in cool stars. Generally speaking, turbulent pressure is an excitation of oscillations, especially in cool delta Scuti and gamma Doradus stars and all cool Cepheid- and Mira-like stars. Turbulent thermal convection, on the other hand, is a damping mechanism against oscillations that actually plays the major role in giving rise to the red edge of the instability strip. Our study shows that oscillations of delta Scuti and gamma Doradus stars are both due to the combination of kappa mechanism and the coupling between convection and oscillations, and they belong to the same class of variables at the low-luminosity part of the Cepheid instability strip. Within the delta Scuti-gamma Doradus instability strip, most of the pulsating variables are very likely hybrids that are excited in both p and g modes.
KeywordConvection Stars: Interiors Stars: Oscillations Stars: Variables: Delta Scuti Stars: Variables: Gamma Doradus
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1093/mnras/stw047
WOS KeywordTIME-DEPENDENT CONVECTION ; EQUATION-OF-STATE ; STELLAR ENVELOPES ; KEPLER OBSERVATIONS ; VARIABLE-STARS ; SCT STARS ; RR LYRAE ; RED EDGE ; OSCILLATIONS ; DOR
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000373583900068
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16185
Collection院士文集_熊大闰
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, D. R.,Deng, L.,Zhang, C.,et al. Turbulent convection and pulsation stability of stars - II. Theoretical instability strip for delta Scuti and gamma Doradus stars[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,457(3):3163-3177.
APA Xiong, D. R.,Deng, L.,Zhang, C.,&Wang, K..(2016).Turbulent convection and pulsation stability of stars - II. Theoretical instability strip for delta Scuti and gamma Doradus stars.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,457(3),3163-3177.
MLA Xiong, D. R.,et al."Turbulent convection and pulsation stability of stars - II. Theoretical instability strip for delta Scuti and gamma Doradus stars".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 457.3(2016):3163-3177.
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