OGLE-III 麦哲伦星云恒星自行数据

We present a catalog of over 6.2million stars with measured proper
motions. All these stars are observed in the direction of the
Magellanic Clouds within the brightness range 12<I<19mag. Based on
these proper motions about 440000 Galactic foreground stars can be
selected. Because the proper motions are based on a few hundred epochs
collected during eight years, their statistical uncertainties are
below 0.5mas/yr for stars brighter than I=18.5mag.

本研究构建了一份包含超620万颗已测定自行（proper motions）的恒星星表。所有目标恒星均观测于麦哲伦云（Magellanic Clouds）天区，星等范围覆盖12<I<19星等（mag）。基于这批自行数据，可筛选出约44万颗银河前景恒星。由于该自行数据基于8年间收集的数百个观测历元，对于I波段亮于18.5星等的恒星，其统计不确定度低于0.5毫角秒每年（mas/yr）。