Key points are not available for this paper at this time.
The energy d~istribution F(X) in the range 3350 A «= X «= 5850 A has been measured with a spectral resolution of 50 A for a number of nearby giant E and SO galaxies and for M31 and M32. The distribution in the near-infrared to X = 10800 A has been obtained for NGC 3379 and NGC 4472. The various distributions, apart from that for M32, are nearly identical and have been averaged to obtain a standard F(X) from which new KB, K~, and KR corrections for the effects of redshifts are calculated, as listed in Table 4. New observations of B - V colors for the several brightest galaxies in thirty-one clusters, covering the redshift range 0 <z «= 0.20, are listed in Table 6. Figure 2 shows the observed color change with redshift. Agreement of the observations with the predicted color change, KB - K~, shows, following an earlier result by Whitford, that the Stebbins-Whitford effect is absent to the 3 per cent level in the broad-band B - V system and that no variation of the shape of F(X) with time is present larger than that implied by z~(B - V) «= 0 03 mag for redshifts as large as z = 0 20 The shape change of F(X) because of evolution of the stellar content in the lookback time must, therefore, be below the limit of present detectability
Oke et al. (Tue,) studied this question.