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Astron. Astrophys. 342, L9-L12 (1999)


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Letter to the Editor

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

Ulrich Hopp 1, Regina E. Schulte-Ladbeck 2, Laura Greggio 1,3 and Dörte Mehlert  *  1

1 Universitätssternwarte München, Scheiner Strasse 1, D-81679 München, Germany (e-mail: hopp@usm.uni-muenchen.de)
2 University of Pittsburgh, Pittsburgh, PA 15260, USA, (e-mail: rsl@phyast.pitt.edu)
3 University of Bologna, I-40100 Bologna, Italy

Received 11 November 1998 / Accepted 24 November 1998

Abstract

We present medium deep CCD imaging in B, V, and I of the Pegasus Dwarf galaxy (And VI) which was recently found by Karachentsev & Karachentseva (1998), and independently also by Armandroff et al. (1999). The Calar Alto 2.2m images 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 brightest stars are resolved in all three colors. Color-magnitude diagrams in either B-V or V-I show the tip of the red giant branch which allows us to estimate a true distance modulus of [FORMULA]. The color-magnitude diagrams and the structure show no evidence for recent star formation, thus, a classification as spheroidal dwarf galaxy with a rather old population seems appropriate. The total absolute magnitude of this dwarf is [FORMULA].

Key words: galaxies: dwarf – galaxies: structure – galaxies: distances and redshifts – galaxies: individual: And VI

* Visiting Astronomer, German-Spanish Astronomical Center, Calar Alto, operated by the Max-Planck-Institut für Astronomie jointly with the Spanish National Commission for Astronomy

Send offprint requests to: U. Hopp

© European Southern Observatory (ESO) 1999

Online publication: December 22, 1998

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