Aperture photometry of star clusters reaches its intrinsic limit when apertures are smaller than about twice the half-light radius, and fails for 10 Myr old clusters regardless of aperture size.
J., Henon, M., & Wielen, R
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Deriving physical parameters of unresolved star clusters. VIII. Limits of aperture photometry for star cluster studies
Aperture photometry of star clusters reaches its intrinsic limit when apertures are smaller than about twice the half-light radius, and fails for 10 Myr old clusters regardless of aperture size.