CCD photometry of 11 dwarf irregular galaxies

We present CCD imaging and photometry in B and Cousins R of the dwarf irregular galaxies UGC 4459 (=DDO 53), UGC 5272 (A=DDO 64 and B), UGC 5340 (=DDO 68), UGC 6456, UGC 7559...本文提供了矮不规则星系UGC 4459（=DDO 53）、UGC 5272（A=DDO 64及B）、UGC 5340（=DDO 68）、UGC 6456、UGC 7559……的B波段与Cousins R波段CCD成像与测光数据。