Fundamental properties of the new dwarf galaxy And VI - alias 'Pegasus Dwarf' - another companion of M31

We present medium deep CCD imaging in B, V, and I of the Pegasus Dwarf gala xy (And VI) which was recently found by Karachentsev & Karachentseva (1998) , and independently also by Armandroff et al. (1999). The Calar Alto 2.2m i mages show a low surface brightness galaxy. Its structure resembles that of the other known dSph companions of M31 And I, II, III, and V. The brightes t stars are resolved in all three colors. Color-magnitude diagrams in eithe r B-V or V-I show the tip of the red giant branch which allows us to estima te a true distance modulus of 24.5 +/- 0.2. The color-magnitude diagrams an d the structure show no evidence for recent star formation, thus, a classif ication as spheroidal dwarf galaxy with a rather old population seems appro priate. The total absolute magnitude of this dwarf is M-V,M-0 = -10.4 +/- 0 .2.