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Andromeda XVII: A New Low Luminosity Satellite of M31
Mike Irwin, Annette Ferguson, Avon Huxor +3
We report the discovery of a new dwarf spheroidal galaxy near M31 based on INT/WFC imaging. The system, Andromeda XVII (And XVII), is located at a projected radius of ~44 kpc from…
Kinematic and Chemical constraints on the formation of M31's inner and outer halo
A. Koch, R. M. Rich, D. B. Reitzel +8
The halo of M31 shows a wealth of substructures that are consistent with satellite accretion. Here we report on kinematic and abundance results from Keck/DEIMOS spectroscopy in the…
An active M8.5 dwarf wide companion to the M4/DA binary LHS4039/LHS4040
R. -D. Scholz, N. Lodieu, R. Ibata +4
Low-mass and brown dwarfs have recently been found as wide companions to many nearby stars, formerly believed to be single. Wide binaries are usually found as common proper motion…
The three dimensional structure of the giant stellar stream in Andromeda
A. W. McConnachie, M. J. Irwin, R. A. Ibata +3
The wide-field CCD camera at the CFH telescope was used to survey the giant stellar stream in the Andromeda galaxy, resolving stars down the red giant branch in M31 to I ~ 25, a ma…