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题名: On the relative surface density change of thermally unstable accretion disks
作者: Wu, XB
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
学科分类: Physics
通讯作者: Wu, XB , CHINESE ACAD SCI,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA.
部门归属: CHINESE ACAD SCI,BEIJING ASTRON OBSERV,BEIJING 100080,PEOPLES R CHINA
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.
收录类别: SCI
原文出处: 查看原文
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/12411
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
Wu, XB. On the relative surface density change of thermally unstable accretion disks[J]. ASTROPHYSICAL JOURNAL,1997,489(1):222-226.
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