Abstract
ABSTRACT The prime focus camera of the Anglo-Australian Telescope has been used to image the object listed by Weinberger (PASP, 107, 58 [1995]) as a possible distant star cluster or dwarf spheroidal galaxy. The CCD data reveal this object to be a distant globular cluster of low central concentration. In particular, the color-magnitude diagram for the cluster core shows a sparse giant branch, a prominent red horizontal branch at R=18.75 and a main sequence turnoff near the limit of the data at R=22.0. A population of possible blue stragglers is also evident. Based on comparisons with the giant branches of standard globular clusters, the reddening to this cluster, designated C J0907-372 (Pyxis), is estimated to be 0.25 ≤ E(B-V) ≤ 0.40. The cluster is then approximately 35 kpc from the Sun and 37 kpc from the galactic center. With a core radius of ~14 pc, an estimated absolute magnitude MV=-5.7 and a dominant red horizontal branch, C J0907-372 (Pyxis) has very similar properties to the other low luminosity globular clusters of the outer galactic halo.
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