We present a catalogue of 285 RR Lyrae stars (RRLs) in the Draco dwarf spheroidal (dSph) galaxy, obtained by combining data from a number of different surveys including the Data Release 2 (DR2) of the European Space Agency cornerstone mission Gaia. We have determined individual distances to the RRLs in our sample using for the first time a Gaia G-band luminosity-metallicity relation (M_G_-[Fe/H]) and study the structure of the Draco dSph as traced by its RRL population. We find that the RRLs located in the western/south-western region of Draco appear to be closer to us, which may be a clue of interaction between Draco and the Milky Way. The average distance modulus of Draco measured with the RRLs is {mu}=19.53+/-0.07mag, corresponding to a distance of 80.5+/-2.6kpc, in good agreement with previous determinations in the literature. Based on the pulsation properties of the RRLs, we confirm the Oosterhoff-intermediate nature of Draco. We present an additional sample of 41 candidate RRLs in Draco, which we selected from the Gaia DR2 catalogue based on the uncertainty of their G-band magnitudes. Additional epoch data that will become available in the Gaia Data Release 3 will help to confirm whether these candidates are bona fide Draco RRLs.

Cone search capability for table J/MNRAS/499/4040/table1 (Characteristics of our final 285 RRLs in Draco)

Cone search capability for table J/MNRAS/499/4040/table3 (RRLs whose membership to Draco is uncertain)

Cone search capability for table J/MNRAS/499/4040/table4 (Characteristics of 51 candidate RRLs discarded from the Draco RRLs)

Cone search capability for table J/MNRAS/499/4040/table5 (Candidate RRLs in Draco selected from the Gaia DR2 catalogue based on the dispersion of their G-band magnitudes ({sigma}G))