Monelli, M.M.MonelliWalker, A. R.A. R.WalkerMartínez-Vázquez, C. E.C. E.Martínez-VázquezStetson, P. B.P. B.StetsonGallart, C.C.GallartBernard, E. J.E. J.BernardBono, G.G.BonoVivas, A. K.A. K.VivasANDREUZZI, GloriaGloriaANDREUZZIDALL'ORA, MassimoMassimoDALL'ORAFIORENTINO, GiulianaGiulianaFIORENTINODorta, A.A.Dorta2020-11-162020-11-1620180035-8711http://hdl.handle.net/20.500.12386/28347We present a search and analysis of variable stars in the recently discovered Crater II dwarf galaxy. Based on B, V, I data collected with the Isaac Newton Telescope (FoV∼0.44 deg<SUP>2</SUP>), we detected 37 variable stars, of which 34 are bone-fide RR Lyrae stars of Crater II (28 RRab, 4 RRc, 2 RRd). We applied the metal-independent (V, B - V) Period-Wesenheit relation and derived a true distance modulus (μ = 20.30 ± 0.08 mag (σ = 0.16 mag). Individual metallicities for RR Lyrae stars were derived by inversion of the predicted I-band Period-Luminosity relation. We find a mean metallicity of [Fe/H] = -1.64 and a standard deviation of σ _{[Fe/H]}=0.21 dex, compatible with either negligible or vanishing intrinsic metallicity dispersion. The analysis of the colour-magnitude diagram reveals a stark paucity of blue horizontal branch stars, at odds with other Galactic dwarfs, and globular clusters with similar metal abundances.STAMPAenArticle10.1093/mnras/sty16452-s2.0-85051467991000441383700001https://academic.oup.com/mnras/article-abstract/479/4/4279/5046475?redirectedFrom=fulltext2018MNRAS.479.4279MFIS/05 - ASTRONOMIA E ASTROFISICA