摘要：AbstractThe physical and kinematical parameters of three pairs of open clusters, NGC 6755 and Czernik 39, NGC 1857 and Czernik 20, Berkeley 70 and SAI 47, are determined using the data from several photometric catalogs in order to confirm or disprove the binarity of these pairs.
关键词：Keywordsopen clusters and associations: individual (NGC 6755, Czernik 39, NGC 1857, Czernik 20, Berkeley 70, SAI 47)
