Abstract
A near-UV and blue rest frame narrow-band filter system is used to investigate the spectrophotometric evolution of elliptical galaxies. Data are presented for mean colors of ellipticals in six distant clusters (z = 0.37-0.46) for comparison with the present-day ellipticals and models of color evolution. Good agreement is found with the UV-cold models of Guiderdoni B. and Rocca-Volmerangre B. (1987, Astron. Astrophys., 186), particularly with the confirmation of a strong post-MS light contribution at z = 0.4. The fraction of starforming to nonstarforming objects (Butcher-Oemler effect) is calculated from rest frame colors.
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