Abstract
The VVV survey observed some of the most crowded and most obscured regions in the inner MilkyWay during the last years. A significant sample of the less known globular clusters in our galaxy lie there. Combining the high-resolution, wide-field, nearinfrared capabilities of the survey camera, the use of 5 different filters, and multi-epoch observations, we are able to overcome many of the previous challenges that prevented a proper study of these objects. Particularly, the identification of the RR Lyrae stars in these globular clusters is proving to be a fundamental tool to establish accurately their distances and reddenings, and to infer information about the Oosterhoff dichotomy that Galactic globular clusters seem to follow.
Highlights
The globular clusters that lie in the inner regions of the Milky Way present important difficulties to extract accurate information about their physical parameters and about their stellar populations
The Vista Variables in the Vía Láctea (VVV) survey has been observing the inner regions of the Milky Way during the last 6 years
RR Lyrae constitute a common type of variable stars in Galactic globular clusters
Summary
The globular clusters that lie in the inner regions of the Milky Way present important difficulties to extract accurate information about their physical parameters and about their stellar populations. The high extinction perceivable when observing towards the inner Galaxy, the high number of field stars in the region which increases the considerable crowding when observing these compact objects and complicates the proper identification of cluster stars, or the presence of some of the most poorlypopulated globular clusters in our Galaxy, are among the most significant of them. The Vista Variables in the Vía Láctea (VVV) survey has been observing the inner regions of the Milky Way during the last 6 years.
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