Newly Identified Star Clusters in M33. I. Integrated Photometry and Color-Magnitude Diagrams

Details Newly Identified Star Clusters in M33. I. Integrated Photometry and Color-Magnitude Diagrams Newly Identified Star Clusters in M33. I. Integrated Photometry and Color-Magnitude Diagrams

2006-09-30

arxiv.org/abs/astro-ph/0610015v1

Astron.J.133:290-302,2007

Astronomy and Astrophysics

Astrophysics

15 pages, 30 figures, accepted for publication in The Astronomical Journal. High resolution version available at http://www.

Scientific paper

10.1086/509779

We present integrated photometry and color-magnitude diagrams (CMDs) for 24 star clusters in M33, of which 12 were previously uncataloged. These results are based on Advanced Camera for Surveys observations from the Hubble Space Telescope of two fields in M33. Our integrated V magnitudes and V-I colors for the previously identified objects are in good agreement with published photometry. We are able to estimate ages for 21 of these clusters using features in the CMDs, including isochrone fitting to the main sequence turnoffs for 17 of the clusters. Comparisons of these ages with the clusters' integrated colors and magnitudes suggest that simple stellar population models perform reasonably well in predicting these properties.

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