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ON 'TORQUELESS' ACCRETION FROM A MAGNETICALLY TRUNCATED DISK

机译:磁截盘的“无扭矩”吸收

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摘要

In a number of recent studies, it has been suggested that a star may accrete matter from a magnetically truncated Keplerian disk without experiencing any significant spin-up torque. Thus, it is asserted that the toroidal field component at the stellar surface is too small to transmit angular momentum from the disk to the star; instead, the material angular momentum at the inner edge of the disk is transported back outward by magnetic stresses acting on the disk. We assess the arguments for "torqueless" accretion and conclude that they are physically unfounded.
机译:在许多最近的研究中,已经提出,恒星可能会从磁性截断的开普勒圆盘中积聚物质,而不会经历任何明显的旋转转矩。因此,可以断定,恒星表面的环形场分量太小,无法将角动量从圆盘传递到恒星。相反,磁盘内边缘的材料角动量通过作用在磁盘上的磁应力向外传回。我们评估“无扭矩”增生的论点,并得出结论,它们在物理上是没有根据的。

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