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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 Stromgren 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.
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