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Title:
The ACS Survey of Galactic Globular Clusters. VI. NGC 6366: A Heavily Stripped Galactic Globular Cluster
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; Majewski, Steven; Marín-Franch, A.; Milone, Antonino; Rosenberg, Alfred; Siegel, Michael
Affiliation:
AA(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA ), AB(Department of Astrophysics, University of La Laguna and Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38200 La Laguna, Spain ), AC(Dipartimento di Astronomia, University di Padova, vicolo dell'Osservatorio 5, I-35122 Padova, Italy ), AD(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA ), AE(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA ), AF(Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 32611, USA ), AG(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA ), AH(Department of Physics and Astronomy, Dartmouth College, 6127 Wilder Laboratory, Hanover, NH 03755, USA ), AI(Department of Physics and Astronomy, Dartmouth College, 6127 Wilder Laboratory, Hanover, NH 03755, USA ), AJ(Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 32611, USA ), AK(Department of Astronomy, University of Virginia, P.O. Box 400325, Charlottesville, VA 22904-4325, USA ), AL(Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38200 La Laguna, Spain ), AM(Dipartimento di Astronomia, Università di Padova, Vicolo dell' Osservatorio 3, Padova, I-35122, Italy ), AN(Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38200 La Laguna, Spain ), AO(University of Texas, McDonald Observatory, 1 University Station, C1402, Austin, TX 78712, USA )
Publication:
The Astronomical Journal, Volume 137, Issue 1, pp. 246-256 (2009). (AJ Homepage)
Publication Date:
01/2009
Origin:
IOP
AJ Keywords:
galaxies: luminosity function, mass function, globular clusters: general, globular clusters: individual: NGC 6366
DOI:
10.1088/0004-6256/137/1/246
Bibliographic Code:
2009AJ....137..246P

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 ~ 9, or masses of ~0.3 M sun. 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 sun. We briefly discuss this interesting anomaly within the context of tidal stripping.

Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program GO-10775.


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