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- Title
Massive open star clusters using the VVV survey III. A young massive cluster at the far edge of the Galactic bar.
- Authors
Ramírez Alegría, S.; Borissova, J.; Chené, A. N.; O'Leary, E.; Amigo, P.; Minniti, D.; Saito, R. K.; Geisler, D.; Kurtev, R.; Hempel, M.; Gromadzki, M.; Clarke, J. R. A.; Negueruela, I.; Marco, A.; Fierro, C.; Bonatto, C.; Catelan, M.
- Abstract
Context. Young massive clusters are key to map the Milky Way's structure, and near-infrared large area sky surveys have contributed strongly to the discovery of new obscured massive stellar clusters. Aims. We present the third article in a series of papers focused on young and massive clusters discovered in the VVV survey. This article is dedicated to the physical characterization of VVVCL086, using part of its OB-stellar population. Methods. We physically characterized the cluster using JHKS near-infrared photometry from ESO public survey VVV images, using the VVV-SkZ pipeline, and near-infrared K-band spectroscopy, following the methodology presented in the first article of the series. Results. Individual distances for two observed stars indicate that the cluster is located at the far edge of the Galactic bar. These stars, which are probable cluster members from the statistically field-star decontaminated CMD, have spectral types between O9 and B0V. According to our analysis, this young cluster (1.0 Myr < age < 5.0 Myr) is located at a distance of 11+5-6 kpc, and we estimate a lower limit for the cluster total mass of (2.8+1.6-1.4) . 10³ M☉. It is likely that the cluster contains even earlier and more massive stars.
- Subjects
GALACTIC dynamics; SUPERGIANT stars; STAR clusters; MILKY Way; NEAR infrared radiation; ASTRONOMICAL photometry
- Publication
Astronomy & Astrophysics / Astronomie et Astrophysique, 2014, Vol 564, p1
- ISSN
0004-6361
- Publication type
Article
- DOI
10.1051/0004-6361/201322619