BISYSTEM OSCILLATION-THEORY OF STARS .1. LINEAR-THEORY
文献类型：期刊论文
| 作者 | Li Y(李焱)
|
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 1992-04 |
| 卷号 | 257期号:1页码:133-144 |
| 关键词 | OSCILLATIONS OF STARS LINEAR OSCILLATION THEORY |
| ISSN号 | 0004-6361 |
| 产权排序 | 第一完成单位 |
| 通讯作者 | LI, Y (通讯作者), CHINESE ACAD SCI, YUNNAN OBSERV, POB 110, KUNMING 650011, PEOPLES R CHINA |
| 英文摘要 | 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%. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | WOLF-RAYET STARS ; STELLAR ENVELOPES ; THERMODYNAMIC QUANTITIES ; INSTABILITY STRIPS ; EVOLVED STARS ; WHITE-DWARFS ; PULSATIONS ; EQUATION ; STATE ; IONIZATION |
| 收录类别 | SCI |
| 原文出处 | http://adsabs.harvard.edu/abs/1992A%26A...257..133L |
| 语种 | 英语 |
| WOS记录号 | WOS:A1992HM10600014 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/9222]  |
| 专题 | 云南天文台_恒星物理研究组 |
| 作者单位 | Yunnan Observatory, Chinese Academy of Sciences, P. O. Box 110, Kunming 650011, People's Republic of China |
| 推荐引用方式 GB/T 7714 | Li Y. BISYSTEM OSCILLATION-THEORY OF STARS .1. LINEAR-THEORY[J]. ASTRONOMY & ASTROPHYSICS,1992,257(1):133-144. |
| APA | Li Y.(1992).BISYSTEM OSCILLATION-THEORY OF STARS .1. LINEAR-THEORY.ASTRONOMY & ASTROPHYSICS,257(1),133-144. |
| MLA | Li Y."BISYSTEM OSCILLATION-THEORY OF STARS .1. LINEAR-THEORY".ASTRONOMY & ASTROPHYSICS 257.1(1992):133-144. |
入库方式： OAI收割
来源：云南天文台
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