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BISYSTEM OSCILLATION-THEORY OF STARS .1. LINEAR-THEORY
Li Y(李焱); LI, Y (通讯作者), CHINESE ACAD SCI, YUNNAN OBSERV, POB 110, KUNMING 650011, PEOPLES R CHINA
发表期刊ASTRONOMY & ASTROPHYSICS
1992-04
卷号257期号:1页码:133-144
产权排序第1完成单位
收录类别SCI
关键词Oscillations Of Stars Linear Oscillation Theory
摘要The linear oscillation theory of stars is improved to include the nonequilibrium effects of the gas and radiation. The nonequilibrium diffusion approximation is used to accurately describe the interaction of the gas with the radiation. The concept of two thermodynamic systems of a radiating fluid is introduced to show the physical processes more clearly in the nonequilibrium diffusion, and it is completely compatible with the radiation-hydrodynamic description of the fluid. The linearized equations as well as the boundary conditions for the oscillation are derived. The characteristics of the oscillation are discussed on the assumption of the adiabatic oscillation. It is found that the equivalent adiabatic compression coefficient, GAMMA(1e), which partly determines the restoring forces of the oscillation, is some kind of weighted average of GAMMA(1)'s for the gas and radiation, and the weight functions depend on the process that the fluid undergoes. For the adiabatic oscillation, the weight functions are the pressures, pressure gradients and pressure perturbations of the gas and radiation. In the nonadiabatic case, a proper GAMMA(1e) can also be defined. But by contrast to the adiabatic case, there is a phase delay, which determines whether the oscillation is overstable or damped, between the restoring force and the oscillation. The equivalent exponent GAMMA(1e) in the equilibrium diffusion may be different from the real one by an order of about 20%.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6361
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WOS记录号WOS:A1992HM10600014
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]WOLF-RAYET STARS ; STELLAR ENVELOPES ; THERMODYNAMIC QUANTITIES ; INSTABILITY STRIPS ; EVOLVED STARS ; WHITE-DWARFS ; PULSATIONS ; EQUATION ; STATE ; IONIZATION
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被引频次:18[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9222
专题恒星物理研究组
通讯作者LI, Y (通讯作者), CHINESE ACAD SCI, YUNNAN OBSERV, POB 110, KUNMING 650011, PEOPLES R CHINA
作者单位Yunnan Observatory, Chinese Academy of Sciences, P. O. Box 110, Kunming 650011, People's Republic of China
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GB/T 7714
Li Y,LI, Y . BISYSTEM OSCILLATION-THEORY OF STARS .1. LINEAR-THEORY[J]. ASTRONOMY & ASTROPHYSICS,1992,257(1):133-144.
APA Li Y,&LI, Y .(1992).BISYSTEM OSCILLATION-THEORY OF STARS .1. LINEAR-THEORY.ASTRONOMY & ASTROPHYSICS,257(1),133-144.
MLA Li Y,et al."BISYSTEM OSCILLATION-THEORY OF STARS .1. LINEAR-THEORY".ASTRONOMY & ASTROPHYSICS 257.1(1992):133-144.
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