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Using a sample of nearly 20,000 massive early-type galaxies selected from theSloan Digital Sky Survey, we study the color-magnitude relation for the mostluminous (L > 2.2 L^{*}) field galaxies in the redshift range 0.1<z<0.4 inseveral colors. The intrinsic dispersion in galaxy colors is quite small in allcolors studied, but the 40 milli-mag scatter in the bluest colors is a factorof two larger than the 20 milli-mag measured in the reddest bands. While eachof three simple models constructed for the star formation history in thesesystems can satisfy the constraints placed by our measurements, none of themproduce color distributions matching those observed. Subdividing byenvironment, we find the dispersion for galaxies in clusters to be about 11%smaller than that of more isolated systems. Finally, having resolved the redsequence, we study the color dependence of the composite spectra. Bluergalaxies on the red sequence are found to have more young stars than redgalaxies; the extent of this spectral difference is marginally better describedby passive evolution of an old stellar population than by a model consisting ofa recent trace injection of young stars.

Broadband Optical Properties of Massive Galaxies: The Dispersion around the Field Galaxy Color-Magnitude Relation Out toz ~ 0.4