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Oscillations of HB red variable stars
Xiong, DR; Cheng, QL; Deng, L; Deubner, FL; ChristensenDalsgaard, J; Kurtz, D
1998
发表期刊NEW EYES TO SEE INSIDE THE SUN AND STARS
ISSN0074-1809
卷号0期号:185页码:401-402
摘要Using 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.
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
学科领域Astronomy & Astrophysics
收录类别ISTP ; SCI
语种英语
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000078932400091
引用统计
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/11186
专题院士文集_熊大闰
作者单位1.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Beijing Astron Observ, Beijing 100080, Peoples R China
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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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