Journal Article

Constraints on the formation of the globular cluster IC 4499 from multiwavelength photometry*

A. R. Walker, A. M. Kunder, G. Andreuzzi, A. Di Cecco, P. B. Stetson, M. Monelli, S. Cassisi, G. Bono, R. De Propris, M. Dall'Ora, J. M. Nemec and M. Zoccali

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 1, pages 643-654
Published in print July 2011 | ISSN: 0035-8711
Published online July 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18736.x
Constraints on the formation of the globular cluster IC 4499 from multiwavelength photometry*

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We present new multiband photometry for the Galactic globular cluster IC 4499 extending well past the main-sequence turn-off in the U, B, V, R, I and DDO 51 bands. This photometry is used to determine that IC 4499 has an age of 12 ± 1 Gyr and a cluster reddening of E(BV) = 0.22 ± 0.02. Hence, IC 4499 is coeval with the majority of Galactic globular clusters, in contrast to suggestions of a younger age. The density profile of the cluster is observed to not flatten out to at least r∼ 800 arcsec, implying that either the tidal radius of this cluster is larger than previously estimated, or that IC 4499 is surrounded by a halo. Unlike the situation in some other, more massive, globular clusters, no anomalous colour spreads in the ultraviolet are detected among the red giant branch stars. The small uncertainties in our photometry should allow the detection of such signatures apparently associated with variations of light elements within the cluster, suggesting that IC 4499 consists of a single stellar population.

Keywords: Hertzsprung; Russell and colour; magnitude diagrams; globular clusters: individual: IC 4499

Journal Article.  9102 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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