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R. L. Phelps (California State University, Sacramento)
Faint-magnitude CCD photometry has been obtained for the clusters ESO 093-SC08 and VandenBerg-Hagen 176. These data reveal ESO 093-SC08 to be an old open cluster, with a derived age of 5.5 ± 1.0 Gyr, a heliocentric distance of 14.00 ± 0.75 kpc, an inferred metallicity between -0.60 < [Fe/H] < -0.20 dex, and Galactocentric positions Rgc = 13.0 ± 0.7 kpc and Z = -1000 ± 50 pc. For VandenBerg-Hagen 176, a derived age of 7.0 ± 1.5 Gyr, a heliocentric distance of 18.00 ± 1.00 kpc, an inferred metallicity between -0.20 < [Fe/H] < 0.20 dex, and Galactocentric positions Rgc = 12.0 ± 0.9 kpc and Z = +1350 ± 100 pc are found. The current results for ESO 093-SC08 are in good agreement with a study by Bica et al. VandenBerg-Hagen 176 appears to be a massive metal-rich old open cluster, similar to NGC 6791, or a young, metal-rich globular cluster.
This research was supported by NSF grant AST-9800216, an Oberlin College Grant-In-Aid award, and grants from the California State University, Sacramento Research and Creative Activities program. An allocation of telescope time from the Carnegie Observatories, that made this research possible, is also gratefully acknowledged.
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Bulletin of the American Astronomical Society, 34
© 2002. The American Astronomical Soceity.