The PYXIS Cluster: A Newly Identified Galactic Globular Cluster

Details The PYXIS Cluster: A Newly Identified Galactic Globular Cluster The PYXIS Cluster: A Newly Identified Galactic Globular Cluster

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...453l..21i&link_type=abstract

Astrophysical Journal Letters v.453, p.L21

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19

Scientific paper

One of the "interesting" objects identified by Weinberger during an eyeball search of sky survey plates for planetary nebulae is a previously unrecognized distant Galactic halo globular cluster. Deep B, R, and I CCD frames of the object to R = 23 reveal it to be a cluster of stars some 2' in core size, with a well-defined main sequence with a turnoff at R = 22 and a sparsely populated subgiant branch leading to a stubby red horizontal branch at R = 18.7. With a reddening-corrected distance modulus of 18.0, corresponding to a distance of 40 kpc, the Pyxis globular cluster is the latest addition to an exclusive club of distant Galactic satellites. Pyxis is similar in morphological appearance to other outer halo globular clusters and lies tantalizingly close to the plane of the Magellanic Clouds orbit (Jones and coworkers), suggesting it might be a detached cluster of this system.

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