Proper motions & radial velocities in M22

The distance to the globular cluster M22 is reexamined from new radial-velocity data and revised proper motions. Proper motions are rederived for 672 stars in the field of M22...本研究基于全新径向速度（radial velocity）数据与修正后的自行（proper motions），对球状星团（globular cluster）M22的距离进行了重新测定。研究人员针对M22天区内的672颗恒星，重新推导得到了其自行参数……