X射线新星中的非定常吸积盘：1975年Monocerotis新星和1991年Muscae新星的爆发模型
Non-Steady State Accretion Disks in X-Ray Novae: Outburst Models for Nova Monocerotis 1975 and Nova Muscae 1991
摘要：
我们用随时间变化的吸积盘模型拟合了两颗X射线新星（Nova Monocerotis 1975 = A0620 - 00和Nova Muscae GS 1991 = 1124 - 683）的爆发。该模型是基于一个新的解决方案的扩散型方程的非稳态吸积，并描述了一个粘性的α-磁盘在一个二进制系统的爆发后的峰值，当在磁盘中的物质完全电离的演变。吸积率在磁盘上按照幂律下降。我们推导出吸积率和有效温度的磁盘公式。该模型有三个自由输入参数：中心物体M的质量、湍流参数α和归一化参数Δ t。模拟结果与观测到的X射线和光学B和V光变曲线进行了比较。由此得出的湍流参数$α$的估计值是相似的：A 0620 - 00为0.2 - 0.4，GS 1124 - 683为0.45 - 0.65，这表明这些源中致密天体周围的吸积盘中的粘性具有相似的性质。我们还推导出这些系统的距离作为其紧凑的对象的质量的函数。
英文摘要：
We fit outbursts of two X-ray novae (Nova Monocerotis 1975=A0620-00 and Nova Muscae GS 1991=1124-683) using a time-dependent accretion disk model. The model is based on a new solution for a diffusion-type equation for the non-steady-state accretion and describes the evolution of a viscous alpha-disk in a binary system after the peak of an outburst, when matter in the disk is totally ionized. The accretion rate in the disk decreases according to a power law. We derive formulas for the accretion rate and effective temperature of the disk. The model has three free input parameters: the mass of the central object M, the turbulence parameter alpha, and the normalization parameter delta t. Results of the modeling are compared with the observed X-ray and optical B and V light curves. The resulting estimates for the turbulence parameter $α$ are similar: 0.2-0.4 for A 0620-00 and 0.45-0.65 for GS 1124-683, suggesting a similar nature for the viscosity in the accretion disks around the compact objects in these sources. We also derive the distances to these systems as functions of the masses of their compact objects.
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