IMAGING OF BUTCHER-OEMLER BLUE GALAXIES AT A REDSHIFT OF 0.2

We have obtained deep B and R images of the spectroscopically confirme d blue cluster members of Abell 963, Abell 2111, and Abell 2125; a tot al of 19 galaxies. We find at least 50% of these blue galaxies are dis k systems or have a disk system as one of their components. This fract ion is undoubtedly higher as some systems are likely to be at inclinat ions unfavorable for determining their disk nature. Many of these disk galaxies are late-type systems apparent from the small bulge-to-disk ratios of these galaxies. Two of these galaxies are definitely spiral galaxies, identifiable because of their nearly face-on orientation, wh ich suggests other disk galaxies are also spirals at inclinations unfa vorable for resolving spiral structure. For the two nearly face-on spi ral galaxies, the star formation appears to be extended over the disk of the galaxy rather than concentrated in the nucleus. If the cluster blue population, which can be as great as 20%, are indeed spirals, eit her clouds of spiral galaxies are falling into the cores of these rich clusters for the first time or spiral galaxies can be transformed int o the elliptical and SO galaxies present in clusters today. Galaxy-gal axy interactions and/or mergers probably play an important role in the transformation of this spiral population.