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P. Barmby, J.P. Huchra (CfA), J.P. Brodie, L.L. Schroder (UCO/Lick), C.J. Grillmair (SIRTF Science Center), D.A. Forbes (U. Birmingham)
We present preliminary results from a new catalog of photometric and spectroscopic data for M31 globular clusters. The catalog includes new optical, near-infrared, and spectroscopic observations; of 440 clusters and cluster candidates, 281 (64%) have at least four-color optical photometry and 229 (52%) have near-infrared photometry. Using this data we estimate the reddening of individual clusters and produce a reddening map of M31. There is some evidence that the halo clusters suffer from more than foreground extinction. We compute the color-metallicity relations for various (dereddened) optical and near-infrared colors; the M31 relations differ from those for Galactic clusters for some colors involving longer-wavelength bandpasses (RIJK). We find no evidence for bimodality in the color or metallicity distributions, and only weak evidence for a small radial metallicity gradient.
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