The Astronomical Journal
We have used observations obtained as part of the Hubble Space Telescope/ACS Survey of Galactic globular clusters (GCs) to construct a color-magnitude diagram for the bulge cluster, NGC 6366. The luminosity function derived from those data extends to M F606W ~ 9, or masses of ~0.3 M ☉. Unlike most GCs, the mass function peaks near the main-sequence turnoff with significantly fewer low-mass stars even after correction for completeness and mass segregation. Using a multimass King model, we extrapolate the global cluster behavior and find the global mass function to be poorly matched by a power law, with a particular deficit of stars with masses between 0.5 and 0.7 M ☉. We briefly discuss this interesting anomaly within the context of tidal stripping.
E. Q. Paust, Nathaniel; Aparicio, Antonio; Piotto, Giampaolo; Reid, I. Neill; Anderson, Jay; Sarajedini, Ata; Bedin, Luigi R.; and Chaboyer, Brian, "The ACS Survey of Galactic Globular Clusters. VI. NGC 6366: A Heavily Stripped Galactic Globular Cluster" (2008). Open Dartmouth: Faculty Open Access Articles. 2082.