On the use of field RR Lyrae as Galactic probes: I. The Oosterhoff dichotomy based on fundamental variables

M. Fabrizio, G. Bono, V. F. Braga +21

We collected a large data set of field RR Lyrae stars (RRLs) by using catalogues already available in the literature and Gaia DR2. We estimated the iron abundances for a sub-sample…