The ACS Survey Of Galactic Globular Clusters. VI. NGC 6366: A Heavily Stripped Galactic Globular Cluster

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Date

2009-01

Authors

Paust, Nathaniel E. Q.
Aparicio, Antonio
Piotto, Giampaolo
Reid, I. Neill
Anderson, Jay
Sarajedini, Ata
Bedin, Luigi R.
Chaboyer, Brian
Dotter, Aaron
Hempel, Maren

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Abstract

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) similar to 9, or masses of similar to 0.3 M(circle dot). 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(circle dot). We briefly discuss this interesting anomaly within the context of tidal stripping.

Department

Astronomy

Description

Keywords

galaxies: luminosity function, mass function, globular clusters:, general, globular clusters: individual (ngc 6366), color-magnitude diagram, lower main-sequence, luminosity function, mass, function, stellar population, advanced camera, stars, catalog, system, isochrones, astronomy & astrophysics

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Citation

Paust, Nathaniel EQ, Antonio Aparicio, Giampaolo Piotto, I. Neill Reid, Jay Anderson, Ata Sarajedini, Luigi R. Bedin et al. >The ACS Survey of Galactic Globular Clusters. VI. NGC 6366: A Heavily Stripped Galactic Globular Cluster.> The Astronomical Journal, Vol. 137, No. 1 (Jan., 2009)

URI

http://hdl.handle.net/2152/34360

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