Massive open star clusters using the VVV survey. V. Young clusters with an OB stellar population

S. Ramírez Alegría, J. Borissova, A. -N. Chené, C. Bonatto, R. Kurtev, P. Amigo, M. Kuhn, M. Gromadzki, J. A. Carballo-Bello

Research output: Contribution to journalArticlepeer-review


Context. The ESO public survey VISTA Variables in the Vía Láctea (VVV) has contributed with deep multi-epoch photometry of the Galactic bulge and the adjacent part of the disk over 526 sq. deg. More than a hundred cluster candidates have been reported thanks to this survey.
Aims: We present the fifth article in a series of papers focused on young and massive clusters discovered in the VVV survey. In this paper, we present the physical characterization of five clusters with a spectroscopically confirmed OB-type stellar population.
Methods: To characterize the clusters, we used near-infrared photometry (J, H, and KS) from the VVV survey and near-infrared K-band spectroscopy from ISAAC at VLT, following the methodology presented in the previous articles of the series.
Results: All clusters in our sample are very young (ages between 1-20 Myr), and their total mass are between (1.07+0.40-0.30)×102 M and (4.17+4.15-2.08)×103 M. We observed a relation between the clusters total mass Mecl and the mass of their most massive stellar member mmax, for clusters with an age Based on observations taken within the ESO VISTA Public Survey VVV (programme ID 179.B-2002), and with ISAAC/VLT (programme 087.D-0341(A)).
Original languageEnglish
Pages (from-to)A40
JournalAstronomy & Astrophysics Letters
Publication statusPublished - 1 Apr 2016


  • stars: early-type
  • stars: massive
  • techniques: photometric
  • techniques: spectroscopic
  • Galaxy: disk
  • open clusters and associations: general
  • Astrophysics - Solar and Stellar Astrophysics
  • Astrophysics - Astrophysics of Galaxies


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