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We present a catalogue of 285 RR Lyrae stars (RRLs) in the Draco dwarfspheroidal galaxy (dSph), obtained by combining data from a number of differentsurveys including the second data release (DR2) of the European Space Agency(ESA) cornerstone mission Gaia. We have determined individual distances to theRRLs in our sample using for the first time a Gaia G-bandluminosity-metallicity relation (MG - [Fe/H]) and study the structure of theDraco dSph as traced by its RRL population. We find that the RRLs located inthe western/south-western region of Draco appear to be closer to us, which maybe a clue of interaction between Draco and the Milky Way (MW). The averagedistance modulus of Draco measured with the RRLs is 19.53 +/- 0.07 mag,corresponding to a distance of 80.5 +/- 2.6 kpc, in good agreement withprevious determinations in the literature. Based on the pulsation properties ofthe RRLs we confirm the Oosterhoff-intermediate nature of Draco. We present anadditional sample of 41 candidate RRLs in Draco, which we selected from theGaia DR2 catalogue based on the uncertainty of their G-band magnitudes.Additional epoch data that will become available in the Gaia third data release(DR3) will help to confirm whether these candidates are bona-fide Draco RRLs.

A fresh look at the RR Lyrae population in the Draco dwarf spheroidal galaxy with Gaia