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http://hdl.handle.net/20.500.12386/28347
Title: | Variable stars in local group galaxies - IV. RR Lyrae stars in the central regions of the low-density galaxy Crater II | Authors: | Monelli, M. Walker, A. R. Martínez-Vázquez, C. E. Stetson, P. B. Gallart, C. Bernard, E. J. Bono, G. Vivas, A. K. ANDREUZZI, Gloria DALL'ORA, Massimo FIORENTINO, Giuliana Dorta, A. |
Issue Date: | 2018 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 479 | Issue: | 4 | First Page: | 4279 | Abstract: | We 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. | URI: | http://hdl.handle.net/20.500.12386/28347 | URL: | https://academic.oup.com/mnras/article-abstract/479/4/4279/5046475?redirectedFrom=fulltext | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/sty1645 | Bibcode ADS: | 2018MNRAS.479.4279M | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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sty1645.pdf | Pdf editoriale | 1.63 MB | Adobe PDF | View/Open |
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