The dwarf spheroidal companions to M31 - Surface-brightness profiles

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Andromeda Galaxy, Astronomical Photometry, Charge Coupled Devices, Color-Magnitude Diagram, Dwarf Galaxies, Stellar Luminosity, Elliptical Galaxies, Metallicity, Stellar Magnitude

Scientific paper

CCD images and surface photometry for the three dwarf spheroidal companions to M31 are presented. The derived light profiles are used to define the faint end of the surface-brightness-luminosity relation for early-type dwarfs. New structural parameters are computed for a subset of the Galactic dwarf spheroidals, which indicate, when compared to the M31 dwarfs, that both sets of dwarf galaxies are similar. A B - V color is measured for And I and found to be in accordance with that expected from the metallicity derived by Mould and Kristian (1990) from their color-magnitude diagram study. Their claim of a color gradient in this galaxy is ruled out. The metallicity-luminosity relation for E galaxies is investigated using these and other new data. It is suggested that a change in slope occurs between the dwarfs and the more luminous E galaxies.

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