Colors and Metallicities of M31 Globular Clusters

Details Colors and Metallicities of M31 Globular Clusters Colors and Metallicities of M31 Globular Clusters

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.1209b&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #12.09; Bulletin of the American Astronomical Society, Vol. 31, p.844

Astronomy and Astrophysics

Astronomy

Scientific paper

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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