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Turbulent convection and pulsational stability of variable stars. II. Oscillations of RR Lyrae and horizontal branch red variable stars
Xiong, DR; Cheng, QL; Deng, L
1998-06-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume500Issue:1Pages:449-465
AbstractUsing a nonlocal time-dependent theory of convection, we have calculated the linear nonadiabatic oscillations of horizontal branch (HB) stars, carefully treating both the dynamic and thermodynamic coupling between convection and oscillations. Turbulent pressure and turbulent viscosity have been included consistently in our equations of nonadiabatic pulsation. When the coupling between convection and oscillations is ignored, for all models with T-e less than or equal to 7350 K, the fundamental through the second overtone are pulsationally unstable, while for T-e less than or equal to 6200 K all the models are unstable up to (at least) the 9th overtone. When the coupling between convection and oscillations is included, the RR Lyrae instability strip is very well predicted. Within the strip, most models are pulsationally unstable only for the fundamental and the first few low-order overtones. The turbulent viscosity is an important damping mechanism. Being exclusively distinct from the luminous red variables (long-period variables), the HE stars to the right of the RR strip are pulsationally stable for the fundamental and low-order overtones, but become unstable for some of the high-order overtones. This may provide a valuable clue to the short-period, low-amplitude red variables found outside the red edge of the RR strip on the H-R diagram of globular clusters. We also present a new radiation-modulated excitation mechanism functioning in a zone of radiation flux gradient. The effects of nonlocal convection and the dynamic coupling between convection and oscillations are discussed. The spatial oscillations of the thermal variables in the pulsational calculations have been effectively suppressed.
KeywordConvection Stars : Horizontal-branch Stars : Oscillations Stars : Variables : Other (Rr Lyrae)
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordSTELLAR ENVELOPES ; GLOBULAR-CLUSTER ; EQUATION ; STATE ; EDGE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000074273300038
Citation statistics
Cited Times:29[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/11181
Collection院士文集_熊大闰
Affiliation1.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Acad Sinica, Beijing Astron Observ, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Xiong, DR,Cheng, QL,Deng, L. Turbulent convection and pulsational stability of variable stars. II. Oscillations of RR Lyrae and horizontal branch red variable stars[J]. ASTROPHYSICAL JOURNAL,1998,500(1):449-465.
APA Xiong, DR,Cheng, QL,&Deng, L.(1998).Turbulent convection and pulsational stability of variable stars. II. Oscillations of RR Lyrae and horizontal branch red variable stars.ASTROPHYSICAL JOURNAL,500(1),449-465.
MLA Xiong, DR,et al."Turbulent convection and pulsational stability of variable stars. II. Oscillations of RR Lyrae and horizontal branch red variable stars".ASTROPHYSICAL JOURNAL 500.1(1998):449-465.
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