| 自引力磁均分和磁守恒吸积盘模型的稳定性分析 |
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| 引用本文： | 陆烨,汪定雄.自引力磁均分和磁守恒吸积盘模型的稳定性分析[J].天文学报,1998,39(3):271-277. |
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| 作者姓名： | 陆烨 汪定雄 |
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| 作者单位： | 华中师范大学物理系天体物理所!武汉，430079(陆烨，杨兰田)，华中理工大学物理系!武汉，430074(汪定雄) |
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| 基金项目： | 国家自然科学基金，国家攀登计划 |
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| 摘 要： | 对自引力磁均分和磁守恒两种模型的径向振荡稳定性的研究表明：在同时考虑自引力和磁场作用的情况下，吸积盘在磁均分和磁守恒模型中均存在着三种振荡模式，其中粘滞模式总是稳定的，磁声模式是不稳定的，中性模式在图中较长波段范围趋于稳定，在较短波段范围是不稳定的．这些结果有利于解释活动天体的Mark421和Pks2155—304的长周期光变现象．同时阐明了自引力在两种模型中对三种模式的影响有相同的趋势，而对磁场则分别起着相反的作用．这个结论表明磁均分吸积盘模型在解释光变现象时更为有利．
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| 关 键 词： | 吸积 吸积盘 磁流体力学不稳定性 |
STABILITY OF THE MAGNETO-EQUIPARTITION MODEL AND MAGNETO-CONSERVATION MODEL OF ACCRETION DISKS WITH SELF-GRAVITATION |
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| Lu Ye, Yang Lan-tian, Wang Ding-xiong.STABILITY OF THE MAGNETO-EQUIPARTITION MODEL AND MAGNETO-CONSERVATION MODEL OF ACCRETION DISKS WITH SELF-GRAVITATION[J].Acta Astronomica Sinica,1998,39(3):271-277. |
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| Authors: | Lu Ye Yang Lan-tian Wang Ding-xiong |
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| Abstract: | The radial oscillation instability of both magneto-equipartition model and magneto-conservation model of accretion disks with self-gravitation is examined in this paper. Our results show that there are three modes in the disk. The viscous mode is always stable, the magneto-acoustic one is unstable and the neutral one tends to be stable in long wavelength region, but unstable in short wavelength region. Meanwhile,the effects of self-gravitation for the three modes are similar in both models, but the effects of the magnetic field are opposite. These results imply that the magneto-equpartition model is the best one for explaining the bine variations of X-ray stars and AGNs. |
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| Keywords: | accretion accretion disk magnetohydrodynamic instability |
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