Accretion by rotating magnetic neutron stars. I. Flow of matter inside the magnetosphere and its implications for spin-up and spin-down of the star
Accretion by rotating magnetic neutron stars. I. Flow of matter inside the magnetosphere and its implications for spin-up and spin-down of the star
复制标题
DOI：
10.1086/155606
复制
发表时间：
1977-10
期刊：
影响因子：
--
通讯作者：
P. Ghosh;F. Lamb;C. Pethick
中科院分区：
文献类型：
--
作者：
P. Ghosh;F. Lamb;C. Pethick
我们研究了吸积物质的流动和旋转中子星磁层内磁场的结构。我们假设这颗恒星的磁场有一个与旋转轴对齐的对称轴，吸积的等离子体在磁层边界附近被恒星磁场缠绕，并且这颗恒星不是一个快速的旋转体。我们表明，对于明亮的x射线源，Alfven表面内的流动可以用磁流体动力学方程很好地描述，并且当在与恒星旋转的框架中观察时，物质沿着场线移动。在慢旋转体的情况下，阿尔芬表面内的物质旋转的方向与朝向恒星的净角动量通量相反。我们还研究了吸积物质对恒星施加的扭矩，以及当恒星吸积圆盘上的物质时，磁层和磁层边界过渡区域内的能量流动。最后，我们简要地评论了我们的结果对脉动x射线源的影响。
We investigate the flow of accreting matter and the configuration of the magnetic field inside the magnetosphere of a rotating neutron star. We assume that the magnetic field of the star has a symmetry axis which is aligned with the rotation axis, that the accreting plasma becomes threaded by the stellar magnetic field near the magnetospheric boundary, and that the star is not a fast rotator. We show that for bright X-ray sources, flow within the Alfven surface is well described by the equations of magnetohydrodynamics and that the matter moves along field lines when viewed in the frame corotating with the star. In the case of slow rotators, matter inside the Alfven surface rotates in a sense opposite that of the net angular momentum flux toward the star. We also study the torque exerted on the star by the accreting matter and the flow of energy within the magnetosphere and the transition region at the magnetospheric boundary, when the star accretes matter from a disk. Finally, we comment briefly on the implications of our results for pulsating X-ray sources.