Oscillations of long-period variables

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	Oscillations of long-period variables
	Xiong, DR; Deng, L ; Cheng, L ; Deubner, FL ; ChristensenDalsgaard, J ; Kurtz, D
刊名	NEW EYES TO SEE INSIDE THE SUN AND STARS
	1998
卷号	0 期号:185 页码:399-400
ISSN号	0074-1809
英文摘要	We 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.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
收录类别	ISTP ; SCI
语种	英语
WOS记录号	WOS:000078932400090
公开日期	2015-04-20
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/11185]
专题	紫金山天文台_院士文集_熊大闰
作者单位	1.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China 2.Chinese Acad Sci, Beijing Astron Observ, Beijing 100080, Peoples R China
推荐引用方式 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.