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Title:
FSR 584 - a new globular cluster in the Galaxy?
Authors:
Bica, E.; Bonatto, C.; Ortolani, S.; Barbuy, B.
Affiliation:
AA(Universidade Federal do Rio Grande do Sul, Departamento de Astronomia, CP 15051, RS, Porto Alegre 91501-970, Brazil ), AB(Universidade Federal do Rio Grande do Sul, Departamento de Astronomia, CP 15051, RS, Porto Alegre 91501-970, Brazil ), AC(Università di Padova, Dipartimento di Astronomia, Vicolo dell'Osservatorio 5, 35122 Padova, Italy ), AD(Universidade de São Paulo, Departamento de Astronomia, Rua do Matão 1226 São Paulo 05508-900, Brazil )
Publication:
Astronomy and Astrophysics, Volume 472, Issue 2, September III 2007, pp.483-488 (A&A Homepage)
Publication Date:
09/2007
Origin:
EDP Sciences
Keywords:
Galaxy: globular clusters: individual: FSR 584
DOI:
10.1051/0004-6361:20078029
Bibliographic Code:
2007A&A...472..483B

Abstract

Aims:We investigate the nature of the recently catalogued star cluster candidate FSR 584, which is projected in the direction of the molecular cloud W 3 and may be the nearest globular cluster to the Sun.
Methods: 2MASS colour-magnitude diagrams, the stellar radial density profile, and proper motions are employed to derive fundamental and structural parameters.
Results: The colour-magnitude diagram morphology and the radial density profile show that FSR 584 is an old star cluster. With proper motions, the properties of FSR 584 are consistent with a metal-poor ([Fe/H]≈-2) globular cluster with a well-defined turnoff and evidence of a blue horizontal-branch. FSR 584 might be a Palomar-like halo globular cluster that is moving towards the Galactic plane, currently at ≈20 pc above it. The distance from the Sun is d_ȯ≈1.4 kpc, and it is located at ≈1 kpc outside the Solar circle. The radial density profile is characterized by a core radius of R_core=0.3±0.1 pc. However, we cannot exclude the possibility of an old open cluster.
Conclusions: Near-infrared photometry coupled to proper motions support the scenario where FSR 584 is a new globular cluster in the Galaxy. The absorption is A_V=9.2±0.6, which makes it a limiting object in the optical and explains why it has so far been overlooked.
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