Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344204h&link_type=abstract
American Astronomical Society, AAS Meeting #213, #442.04; Bulletin of the American Astronomical Society, Vol. 41, p.319
Astronomy and Astrophysics
Astronomy
Scientific paper
We present an empirical assessment of the use of broadband optical colors as age indicators for unresolved extragalactic clusters and investigate stochastic sampling effects on integrated colors. We use the integrated properties of Galactic open clusters as models for unresolved extragalactic clusters. The population synthesis code Starburst99 and four optical colors were used to estimate how well we can recover the ages of 62 well-studied Galactic open clusters with published ages. We provide a method for estimating the ages of unresolved clusters and for reliably determining the uncertainties in the age estimates. Our results support earlier conclusions based on comparisons to synthetic clusters, namely the (U-B) color is critical to the estimation of the ages of star forming regions. We compare the observed optical colors with those obtained from Starburst99 using the published ages and get good agreement. The scatter in the (B-V)observed - (B-V)model is larger for lower luminosity clusters, perhaps due to stochastic effects.
Giroux Mark Laird
Hancock Mark
Smith Jeffrey B.
Struck Curtis
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