Dynamics of the poor clusters MKW 4 and AWM 4

The redshifts and apparent magnitudes of MKW 4 and AWM 4 are determined on the basis of 390-560-nm spectra and CCD-detector R photometry obtained with the 1.3-m telescope at McGraw-Hill Observatory in February and May 1983 and April 1984. The line-of-sight velocity dispersions and virial mass/light ratios are found to be 459 + 66 or - 52 km/s and 185 + or - 14 solar mass/solar luminosity for MKW 4 and 668 + 178 or - 120 km/s and 550 + or - 140 solar mass/solar luminosity for AWM 4.