超冷和超活力：M和L矮星的旋转和活动
Ultra-Cool and Extra-Vigorous: Rotation and Activity in M and L dwarfs
摘要：
在过去几年中，对光谱类M和L的低质量恒星或褐矮星的自转和活动的研究取得了巨大进展。我总结了测量活动，旋转，有时磁场的不同工作的结果。磁活动的产生似乎在完全对流星的阈值上没有变化，即观察到磁发电机的效率没有变化。另一方面，旋转制动强度的突然变化出现在充分对流的阈值质量，和强有力的证据存在旋转制动减弱与较低的质量。一个可能的解释是，随着物体完全对流，场拓扑结构从偶极变为小尺度结构。
英文摘要：
The study of rotation and activity in low-mass stars or brown dwarfs of spectral classes M and L has seen enormous progress during the last years. I summarize the results from different works that measured activity, rotation, and sometimes magnetic fields. The generation of magnetic activity seems to be unchanged at the threshold to completely convective stars, i.e. no change in the efficiency of the magnetic dynamos is observed. On the other hand, a sudden change in the strength of rotational braking appears at the threshold mass to full convection, and strong evidence exists for rotational braking weakening with lower mass. A probable explanation is that the field topology changes from dipolar to small scale structure as the objects become fully convective.
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