Old star clusters in M101 from HST

We present a new photometric catalog of 326 candidate globular clusters (GCs) in the nearby spiral galaxy M101, selected from B, V, and I Hubble Space Telescope Advanced Camera...我们报道了邻近旋涡星系M101内326个候选球状星团（globular clusters, GCs）的全新测光星表，该样本基于B、V、I波段的哈勃空间望远镜先进相机数据筛选得到。