Pritzl, Barton J; Knezek, Patricia M; Gallagher, John S; Grossi, Marco; Disney, Mike J; Minchin, R F; Freeman, Kenneth; Tolstoy, Eline; Saha, Abhijit
We present Hubble Space Telescope/WFPC2 observations of the dwarf galaxy HIPASS J1321 - 31. This unusual galaxy lies in the direction of the Centaurus A group of galaxies and has a color-magnitude diagram with a distinctive red plume of luminous stars. This feature could arise from (1) a red giant branch if the galaxy were much nearer than previously recognized, (2) a peculiar asymptotic giant branch, or (3) an ∼1 Gyr old population of intermediate-mass red supergiants, which we find to be the...[Show more]
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