吸积盘被困在共转附近
Accretion Discs Trapped Near Corotation
摘要：
我们表明，光盘吸积到旋转的恒星的磁层可以最终在一个“被困”的状态，其中光盘的内边缘保持在共转半径附近，即使在低和变化的吸积率。在这些捕获状态的吸积可以是稳定的或循环的，我们探讨这些国家在很宽的参数空间。我们发现两个不同的区域的不稳定性，一个相关的积累和释放的质量外的磁盘共转，其他大规模存储在过渡区附近的共转。通过一组长时间尺度上的计算，我们展示了如何从非吸积和完全吸积的初始条件演化出捕获态，并计算了循环吸积对恒星自旋演化的影响。对这里发现的周期的观测将为磁层吸积的物理学提供重要线索。在这方面讨论了最近的观测周期和其他不寻常的变化金牛T星（EXOR）和X射线双星。
英文摘要：
We show that discs accreting onto the magnetosphere of a rotating star can end up in a 'trapped' state, in which the inner edge of the disc stays near the corotation radius, even at low and varying accretion rates. The accretion in these trapped states can be steady or cyclic; we explore these states over wide range of parameter space. We find two distinct regions of instability, one related to the buildup and release of mass in the disk outside corotation, the other to mass storage within the transition region near corotation. With a set of calculations over long time scales we show how trapped states evolve from both nonaccreting and fully accreting initial conditions, and also calculate the effects of cyclic accretion on the spin evolution of the star. Observations of cycles such as found here would provide important clues on the physics of magnetospheric accretion. Recent observations of cyclic and other unusual variability in T Tauri stars (EXors) and X-ray binaries are discussed in this context.
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