The Dwarf Spheroidal Companions to M31: WFPC2 Observations of Andromeda III
The Hubble Space Telescope WFPC2 camera has been used to image Andromeda III, a dwarf spheroidal (dSph) companion to M31. The resulting color-magnitude (c-m) diagrams reveal for the first time the morphology of the horizontal branch (HB) in this dwarf galaxy. We find that like Andromeda I and Andromeda II, and like most of the Galactic dSph companions, the HB morphology of And III is predominantly red, redder indeed than that of both And I and And II despite And III having a lower mean...[Show more]
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