The physical nature of a series of 20 new open clusters is confirmed employing existing data on putative star members,ma......

Quasars are essential for astrometry in the sense that they are spatially stationary because of their large distance fro......

基于日本红外卫星AKARI／FIS~年轻恒星体样本，通过匹配Hipparcos（HighPrecisionParallaxCollectingSatellitel的数据库共计得~ilJ21个......