On the relative surface density change of thermally unstable accretion disks
文献类型：期刊论文
| 作者 | Wu, XB; Wu, XB , CHINESE ACAD SCI,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA. |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 1997 |
| 卷号 | 489期号:1页码:222-226 |
| 关键词 | Advection-dominated Accretion Black-holes Binary-systems Instability Stability Model |
| ISSN号 | 0004-637X |
| 英文摘要 | The relations among the relative changes of surface density, temperature, disk height, and vertically integrated pressure in three kinds of thermally unstable accretion disks are quantitatively investigated, assuming local perturbations. The surface density change is found to be very small in the long perturbation wavelength case but cannot be ignored in the short-wavelength case. It becomes significant in an optically thin, radiative cooling-dominated disk when the perturbation wavelength is shorter than 15H (where H is the scale height of disk) and in a geometrically thin, optically thick and radiation pressure-dominated disk when the perturbation wavelength is shorter than 50H. In an optically thick, advection-dominated disk, which is thermally unstable against short-wavelength perturbations, the relative surface density change is much larger. We prove the positive correlation between the changes of surface density and temperature in an optically thick, advection-dominated disk that has previously been claimed to be the essential point of its thermal instability. Moreover, we find an anticorrelation between the changes of disk height and temperature in an optically thick, advection-dominated disk. This is the natural result of the absence of appreciable vertically integrated pressure change. |
| 学科主题 | Physics |
| URL标识 | 查看原文 |
| 公开日期 | 2012-08-29 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/12411]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 通讯作者 | Wu, XB , CHINESE ACAD SCI,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA. |
| 推荐引用方式 GB/T 7714 | Wu, XB,Wu, XB , CHINESE ACAD SCI,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA.. On the relative surface density change of thermally unstable accretion disks[J]. ASTROPHYSICAL JOURNAL,1997,489(1):222-226. |
| APA | Wu, XB,&Wu, XB , CHINESE ACAD SCI,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA..(1997).On the relative surface density change of thermally unstable accretion disks.ASTROPHYSICAL JOURNAL,489(1),222-226. |
| MLA | Wu, XB,et al."On the relative surface density change of thermally unstable accretion disks".ASTROPHYSICAL JOURNAL 489.1(1997):222-226. |
入库方式： OAI收割
来源：理论物理研究所
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