Activity and kinematics of ultracool dwarfs

We present the activity and kinematics of a representative volume-limited (20pc) sample of 152 late-M and L dwarfs (M7-L8) photometrically selected from the Two Micron All Sky...本文报道了152颗晚型M矮星与L矮星（光谱型范围M7至L8）的活动特性与运动学特征；该样本为体积限为20秒差距（pc）的代表性样本，通过测光方法从2微米全天巡天（Two Micron All Sky）……中筛选得到。