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Oscillations of long-period variables
Xiong, DR; Deng, L; Cheng, L; Deubner, FL; ChristensenDalsgaard, J; Kurtz, D
AbstractWe have performed a linear pulsational stability survey of long period variable models. The dynamic and thermodynamic couplings between convection and oscillations are treated by using a statistical theory of nonlocal and time-dependent convection. The results show that the fundamental and all the low overtones are always pulsationally unstable for the low-temperature models when the coupling between convection and oscillations is ignored. When the coupling is considered, there is indeed a "Mira" pulsationally instability region outside of the Cepheid instability strip on the H-R diagram. The coolest models near the Hayashi track are pulsationally stable. Towards high temperature the fundamental mode first becomes unstable, and then the first overtone. Some of the 2nd -4th overtones may become unstable for the hotter models. All the modes higher than 4th (n > 4) are pulsationally stable. The position and the width of such an instability region on the H-R diagram critically depends on the mass, luminosity and metal abundance of the star.
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
Indexed ByISTP ; SCI
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000078932400090
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Document Type期刊论文
Affiliation1.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Beijing Astron Observ, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Xiong, DR,Deng, L,Cheng, L,et al. Oscillations of long-period variables[J]. NEW EYES TO SEE INSIDE THE SUN AND STARS,1998,0(185):399-400.
APA Xiong, DR,Deng, L,Cheng, L,Deubner, FL,ChristensenDalsgaard, J,&Kurtz, D.(1998).Oscillations of long-period variables.NEW EYES TO SEE INSIDE THE SUN AND STARS,0(185),399-400.
MLA Xiong, DR,et al."Oscillations of long-period variables".NEW EYES TO SEE INSIDE THE SUN AND STARS 0.185(1998):399-400.
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