Photoelectric and CCD photometry of E and S0 galaxies

Abstract

We present BR photoelectric photometry for 352 E and S0 galaxies that are part of a large survey of the properties and peculiar motions of galaxies in distant clusters. Repeat measurements show our internal errors to be 2-3 percent in B and R and 1-2 percent in B-R. Comparisons of BR and BVR reductions for 10 galaxies also observed in V show small systematic errors due to differences between the spectral energy distributions of stars and galaxies. External comparisons with B-V colors in the literature confirm that these colors are good to 1 percent. We also describe R-band CCD observations for 95 of the galaxies and place these on a BR photometric system for photoelectric and CCD photomerry, with a common zero-point good to better than 1 percent. We find the rms precision of both our photoelectric and CCD R magnitudes to be 2-3 percent for galaxies as faint as R = 15. Show more