AAS 207th Meeting, 8-12 January 2006
Session 69 Stellar Evolution
Poster, Tuesday, 9:20am-6:30pm, January 10, 2006, Exhibit Hall

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[69.14] A Deep Galex Color-Magnitude Diagram of the Galactic Globular Cluster M79

R. Schiavon, R.W. O'Connell, R.T. Rood (University of Virginia), E. Valenti, F. Ferraro (Bologna), E. Green, J. Liebert (Steward Observatory), R. Peterson (Lick Observatory)

Based on deep UV imaging of M 79 (NGC 1904), we have constructed the first GALEX color-magnitude diagram of a Galactic globular cluster. Our photometry reaches three magnitudes deeper in the far-UV than the deepest previous exposures, from the UIT telescope. As a result, we obtain a thorough characterization of the hot population in this well-known globular cluster. Here we present our first results for hot horizontal branch and blue straggler stars. In particular, with the large field of view provided by GALEX we were able to unveil the existence of a very large population of blue straggler candidates at very large distances from the cluster center. This result is discussed in light of the competing scenarios for the formation of blue stragglers in globular clusters.

This work was supported in part by GALEX grant NNG05GE50G administered by JPL.

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Bulletin of the American Astronomical Society, 37 #4
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