含平流双温吸积盘的振荡不稳定性研究

A Study On the Oscillatory Instability of a Hot Two-temperature Accretion Disc including Advection

从流体动力学方程出发，用微扰法得出含平流双温吸积盘的径向、环向不稳定性的色散方程．并对平流和径向粘滞力对双温吸积盘的影响进行了较详细的讨论．结果表明：平流和径向粘滞力对声模有较大的影响，且不改变粘滞模和热模的稳定性质．而环向扰动对吸积盘的各种模有着较明显的作用．这一模型有利于解释活动天体的周期和准周期光变现象．

The radial-azimuthal instability of a hot two-temperature accretion disc with advectionis analyzed. After obtaining the dispersion equation, we find that advection and viscous forcehave an influence on the stability of acoustic modes, but not on the stability of thermal andviscous modes. We also find azimuthal perturbations to affect the stability of all the modes.This model may be useful in explaining the quasi-periodic or periodic luminosity variationsin various astronomical objects.