| 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
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| 发表期刊 | ASTRONOMY & ASTROPHYSICS
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| 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 |
| ISSN | 0004-6361 |
| URL | 查看原文 |
| 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 |
| 引用统计 | |
| 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 |
| 第一作者单位 | 中国科学院云南天文台 |
| 推荐引用方式 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. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
| BISYSTEM OSCILLATION（358KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 | |
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