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The Andromeda Dwarf Spheroidal Galaxies

Published online by Cambridge University Press:  25 May 2016

Taft E. Armandroff  and
Gary S. Da Costa
Taft E. Armandroff
Affiliation:
Kitt Peak National Observatory, National Optical Astronomy Observatories,1 P.O. Box 26732, Tucson, AZ 85726, USA
Gary S. Da Costa
Affiliation:
Research School of Astronomy & Astrophysics, Australian National University, Private Bag, Weston Creek P.O., ACT 2611, Australia

Abstract

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Our current knowledge of M31's dwarf spheroidal companions is reviewed. Two topics of recent interest constitute the bulk of this review. First, color-magnitude diagrams reaching below the horizontal branch have been constructed for two M31 dwarf spheroidals, based on images from HST/WFPC2. The horizontal branches are predominantly red in both galaxies, redder than expected for their metallicity based on Galactic globular clusters. Thus, the second parameter effect is seen in the M31 halo. Second, recent surveys have revealed three new dwarf spheroidal companions to M31. Thus, dwarf spheroidal galaxies are not as rare around M31 as previously thought and as a result, some properties of the M31 companion system have changed.

Type
Part 2: The Database
Information
Symposium - International Astronomical Union , Volume 192: The Stellar Content of Local Group Galaxies , 1999 , pp. 203 - 217
Copyright
Copyright © Astronomical Society of the Pacific 1999 

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