2006/09/30 by Ata Sarajedini, M. K. Barker, D. Geisler +4 · 2 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/509779
published as Astron.J.133:290-302,2007 · 15 pages, 30 figures, accepted for publication in The Astronomical Journal. High resolution version available at http://www.astro.ufl.edu/~ata/M33_new_clusters1.pdf
arxiv created 2006/09/30 · openalex publication_date 2006/12/13 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
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 previously 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.