SIMBAD references

2018MNRAS.479.4279M - Mon. Not. R. Astron. Soc., 479, 4279-4291 (2018/October-0)

Variable stars in local group galaxies - IV. RR Lyrae stars in the central regions of the low-density galaxy Crater II.

MONELLI M., WALKER A.R., MARTINEZ-VAZQUEZ C.E., STETSON P.B., GALLART C., BERNARD E.J., BONO G., VIVAS A.K., ANDREUZZI G., DALL'ORA M., FIORENTINO G. and DORTA A.

Abstract (from CDS):

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 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.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: general - stars: horizontal branch - stars: variables: RR Lyrae - galaxies: evolution - Local Group

Nomenclature: Table 2: [MWM2018] V098 N=1.

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 66

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2021.04.17-06:53:01

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