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

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DOIResolve DOI: http://doi.org/10.1111/j.1365-2966.2011.18736.x
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TypeArticle
Journal titleMonthly Notices of the Royal Astronomical Society
ISSN0035-8711
Volume415
Issue1
Pages643654; # of pages: 12
SubjectHertzsprung; Russell and colour; magnitude diagrams; globular clusters: individual: IC 4499
AbstractWe 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 DDO51 bands. This photometry is used to determine that IC 4499 has an age of 12 +/- 1 Gyr and a cluster reddening of E(B - V) = 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 similar to 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.
Publication date
PublisherJohn Wiley and Sons
LanguageEnglish
AffiliationNRC Herzberg Institute of Astrophysics; National Research Council Canada
Peer reviewedYes
NPARC number19734687
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Record identifier6c4639a4-a5eb-4c73-88db-10344f3ae29e
Record created2012-03-28
Record modified2016-05-09
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