Bulge RR Lyrae stars in the VVV tile $\textit{b201}$
F. Gran, D. Minniti, R. K. Saito, C. Navarrete, I. D\'ek\'any, I., McDonald, R. Contreras Ramos, M. Catelan

TL;DR
This study identifies and analyzes RR Lyrae stars in the VVV survey's tile b201, measuring their distances and extinction to understand their distribution in the Galactic bulge.
Contribution
First near-IR survey to discover and characterize RR Lyrae stars in this specific bulge region, providing new distance and extinction measurements.
Findings
39 RR Lyrae stars identified, including 29 new discoveries.
Distances estimated around 8.1 to 8.5 kpc, consistent with a spheroidal bulge distribution.
Reddening and extinction values derived for all RRab stars.
Abstract
The VISTA Variables in the V\'ia L\'actea (VVV) Survey is one of the six ESO public surveys currently ongoing at the VISTA telescope on Cerro Paranal, Chile. VVV uses near-IR () filters that at present provide photometry to a depth of mag in up to 36 epochs spanning over four years, and aim at discovering more than 10 variable sources as well as trace the structure of the Galactic bulge and part of the southern disk. A variability search was performed to find RR Lyrae variable stars. The low stellar density of the VVV tile , which is centered at () (), makes it suitable to search for variable stars. Previous studies have identified some RR Lyrae stars using optical bands that served to test our search procedure. The main goal is to measure the reddening, interstellar extinction, and distances of…
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