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- W2810904123 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 deg2), 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 |$sigma _{[rm Fe/H]}=0.21$| 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." @default.
- W2810904123 created "2018-07-10" @default.
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- W2810904123 date "2018-06-28" @default.
- W2810904123 modified "2023-09-25" @default.
- W2810904123 title "Variable stars in local group galaxies – IV. RR Lyrae stars in the central regions of the low-density galaxy Crater II" @default.
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