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Absolute magnitude-color relation for early type spirals
The color-magnitude (CM) relation in early-type spirals is investigatedusing narrow-band observations of (u-V) color indices and V magnitudesfor 28 early-type spirals in the Virgo cluster complex and 13 additionalgalaxies in 11 other clusters or groups. The color indices andmagnitudes of each galaxy are corrected for various systematic errorsand observational effects, and a CM relation is derived for the Virgo Icluster. This CM relation is shown to be universal and to have the sameslope, intrinsic dispersion, and absolute zero point in all examinedgroups at distances of 4 to 63 Mpc. Scatter in the CM relation isassessed, and observations of the Mg index for the galaxies in the VirgoI cluster are reported. It is suggested that the CM relation isindependent of the environment where a galaxy formed.
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