Volume 564, April 2014
|Number of page(s)||4|
|Published online||03 April 2014|
Massive open star clusters using the VVV survey
Instituto de Física y Astronomía, Universidad de Valparaíso
Av. Gran Bretaña 1111, Playa Ancha, Casilla
2 The Millennium Institute of Astrophysics (MAS), Santiago, Chile
3 Gemini North Observatory, USA
4 Pontificia Universidad Católica de Chile, Instituto de Astrofísica, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile
5 Universidade Federal de Sergipe, Departamento de Física, Av. Marechal Rondon s/n, 49100-000 São Cristóvão SE, Brazil
6 Departamento de Astronomía, Casilla 160-C, Universidad de Concepción, Chile
7 Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Universidad de Alicante, Spain
8 Escuela Superior de Física y Matemáticas del Instituto Politécnico Nacional, Unidad Profesional Adolfo López Mateos, Mexico
9 Universidade Federal do Rio Grande do Sul, Departamento de Astronomia, CP 15051, RS 91501-970 Porto Alegre, Brazil
Accepted: 11 March 2014
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 VVV CL086, 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 B0 V. 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.
Key words: stars: early-type / stars: massive / Galaxy: disk / open clusters and associations: individual: VVV CL086 / techniques: spectroscopic / techniques: photometric
Based on observations taken within the ESO VISTA Public Survey VVV (programme ID 179.B-2002), and with ISAAC, VLT, ESO (programme 087.D-0341A).
Near-IR photometry of the most probable cluster members is only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (184.108.40.206) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/564/L9
© ESO, 2014
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