AAS 207th Meeting, 8-12 January 2006
Session 128 (Extra) Galactic Globular Clusters
Poster, Wednesday, 9:20am-6:30pm, January 11, 2006, Exhibit Hall

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[128.03] The Properties of Globular Cluster ESO452-SC11

A.S.M. Cornish (UM-College Park), R.L. Phelps (NSF, CSU-Sacramento), M.M. Briley (NSF, UW-Oshkosh), E.D. Friel (NSF)

The globular cluster ESO452-SC11 has been observed using Johnson V and Cousin I filters and PSF photometry has been performed. The resulting color-magnitude diagrams were compared to theoretical isochrones to derive the cluster's age, overall chemical composition, and distance modulus. These isochrone models include those published by Girardi et al., Bergbusch & VandenBerg with BVRI color-Teff relations as described by VandenBerg & Clem, and Demarque et al. (known as the Yale isochrones). From the Yale isochrones, it is estimated that the cluster has an age 9-11 Gyr, a metallicity [Fe/H] between -1.4 and -1.0 dex, and a distance modulus (m-M)V =16.10-16.31 mag resulting in a heliocentric distance of 7.3-7.5 kpc. Using the Bergbusch & VandenBerg models, it is estimated that the cluster has an age of 11-13 Gyr, with an iron-to hydrogen ratio between -1.3 and -0.8 dex, a distance modulus (m-M)V =15.87-16.12 mag, and a heliocentric distance between 7.0-7.2 kpc. The Girardi isochrone models yield a derived age of 13-16 Gyr, metallicity between -1.3 and -0.4 dex, distance modulus (m-M)V =15.59-16.19 mag, and heliocentric distance between 6.6-7.1 kpc. The derived parameters from these models are consistent for metallicity [Fe/H] between -1.3 and -1.0 dex, reddening E(V-I) =0.70 - 0.76, and (m-M)V =16.10 - 16.12 mag.

A.C. would like to acknowledge the HACU National Internship program for supporting the data analysis portion of this research.

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