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Oscillations of HB red variable stars
Xiong, DR; Cheng, QL; Deng, L; Deubner, FL; ChristensenDalsgaard, J; Kurtz, D
1998
Source PublicationNEW EYES TO SEE INSIDE THE SUN AND STARS
ISSN0074-1809
Volume0Issue:185Pages:401-402
AbstractUsing a nonlocal time-dependent theory of convection, we have calculated the linear non-adiabatic oscillations of the Horizontal Branch (HB) stars, with both the dynamic and thermodynamic coupling between convection and oscillations been carefully treated. Turbulent pressure and turbulent viscosity have been included consistently in our equations of non-adiabatic pulsation. When the coupling between convection and oscillations is ignored, for all models with T-e less than or equal to 7350K, the fundamental through the second overtone are pulsationally unstable; while for T-e less than or equal to 6200K 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 overtones. 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 Lyrae 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 for the short period, low amplitude red variables found outside the red edge of the RR Lyrae strip on the H-R diagram of globular clusters. Moreover, we present a new radiation modulated excitation mechanism functioning in radiation flux gradient regions. 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.
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
Indexed ByISTP ; SCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000078932400091
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/11186
Collection院士文集_熊大闰
Affiliation1.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Beijing Astron Observ, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Xiong, DR,Cheng, QL,Deng, L,et al. Oscillations of HB red variable stars[J]. NEW EYES TO SEE INSIDE THE SUN AND STARS,1998,0(185):401-402.
APA Xiong, DR,Cheng, QL,Deng, L,Deubner, FL,ChristensenDalsgaard, J,&Kurtz, D.(1998).Oscillations of HB red variable stars.NEW EYES TO SEE INSIDE THE SUN AND STARS,0(185),401-402.
MLA Xiong, DR,et al."Oscillations of HB red variable stars".NEW EYES TO SEE INSIDE THE SUN AND STARS 0.185(1998):401-402.
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