Abstract
A discussion of the total space motions of early-type members of young disk population superclusters, derived from distances based on a photometric calibration of four-color and Hβ photometry, shows an increase in total velocity with increasing radial distance from the Sun, within each supercluster. The rate of increase with distance varies from supercluster to supercluster because it results from the interaction of two effects − an «expansion» that involves the total space motion and a «rotation» that involves only the V-velocity because it arises from the requirement that supercluster members have isoperiodic, galactic orbits
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