AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 12. Extra Galactic Star Clusters: From Ancient Globulars to Young Star Clusters
Display, Monday, May 31, 1999, 9:20am-6:30pm, Southwest Exhibit Hall

[Previous] | [Session 12] | [Next]

[12.09] Colors and Metallicities of M31 Globular Clusters

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.

If the author provided an email address or URL for general inquiries, it is a s follows:

[Previous] | [Session 12] | [Next]