This paper presents deep narrow band photometry of the cluster A2317 ( z = 0.211 ) carried out using KPNO 4 m and Steward 2.3 m telescopes .
Using rest frame Strömgren photometry , it is determined that A2317 has an unusually high fraction of blue galaxies ( the Butcher-Oemler effect ) for its redshift ( f _ { B } = 0.35 ) .
We demonstrate that the ratio of blue to red galaxies has a strong dependence on absolute magnitude such that blue galaxies dominate the top of the luminosity function .
Spectrophotometric classification shows that a majority of the red galaxies are E/S0 ’ s , with a small number of reddened starburst galaxies .
Butcher-Oemler galaxies are shown to be galaxies with star formation rates typical of late-type spirals and irregular .
Starburst systems were typically found to be on the lower end of the cluster luminosity function .
In addition , blue galaxies are preferentially found in the outer edges of the cluster , whereas the red galaxies are concentrated in the cluster core .