J/MNRAS/492/1061ivo://CDS.VizieR/J/MNRAS/492/1061doi:10.26093/cds/vizier.74921061CDSVivas A.K.Walker A.R.Martinez-Vazquez C.E.Monelli M.Bono G.,Dorta A.Nidever D.L.Fiorentino G.Gallart C.Andreuzzi G.,Braga V.F.Dall'Ora M.Olsen K.Stetson P.B.2024-08-20T20:15:19Z2023-05-24T13:43:00ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frvariable-starsdwarf-galaxiesgalaxiesphotometryvisible-astronomyTime series observations of a single dithered field centred on the diffuse dwarf satellite galaxy Crater II were obtained with the Dark Energy Camera (DECam) at the 4m Blanco Telescope at Cerro Tololo Inter-American Observatory, Chile, uniformly covering up to two half-light radii. Analysis of the g and i time series results in the identification and characterization of 130 periodic variable stars, including 98 RR Lyrae stars, 7 anomalous Cepheids, and 1 SX Phoenicis star belonging to the Crater II population, and 24 foreground variables of different types. Using the large number of ab-type RR Lyrae stars present in the galaxy, we obtained a distance modulus to Crater II of (m-M)_0_=20.333+/-0.004 (stat) +/-0.07 (sys). The distribution of the RR Lyrae stars suggests an elliptical shape for Crater II, with an ellipticity of 0.24 and a position angle of 153{deg}. From the RR Lyrae stars, we infer a small metallicity dispersion for the old population of Crater II of only 0.17dex. There are hints that the most metal-poor stars in that narrow distribution have a wider distribution across the galaxy, while the slightly more metal-rich part of the population is more centrally concentrated. Given the features in the colour-magnitude diagram of Crater II, the anomalous Cepheids in this galaxy must have formed through a binary evolution channel of an old population.2020MNRAS.492.1061Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/492/1061CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/492/1061https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/492/1061http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/492/1061https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/492/1061https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/492/1061http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/492/1061GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/492/1061/table1 (Periodic variable stars in Crater II)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/492/1061/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/492/1061/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/492/1061/table1?GETtext/xml+votable180.050000true177.1956-18.624720.0055555555555555565/6295 6/25174-25175 25354https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/492/1061?format=asciiOpticaldefaultJ/MNRAS/492/1061/table1Periodic variable stars in Crater IISimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject identifier (VNNN) (for V1-V97 as [JKY2018] VNNN in Simbad and for V97-V134 as [MWM2018] VNNN in Simbad)meta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainPeriodVariability perioddsrc.vardoubleo_gmagNumber of observations in the g-bandmeta.numberintAmpgVariability amplitude in the g-bandmagsrc.var.amplitudefloatgmagMean magnitude in the g-bandmagphot.mag;em.opt.Bfloato_imagNumber of observations in the i-bandmeta.numberintAmpiVariability amplitude in the i-bandmagsrc.var.amplitudefloatimagMean magnitude in the i-bandmagphot.mag;em.opt.IfloatE(B-V)Colour excess from Schlegel et al. (1998ApJ...500..525S)magphot.color.excessfloatTypeVariability type (1)meta.notecharLCLight curvesmeta.ref.urlcharJ/MNRAS/492/1061/table2Time series photometry of variable stars in the field of view of Crater IIrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDObject identifier (VNNN) (for V1-V97 as [JKY2018] VNNN in Simbad and for V97-V134 as [MWM2018] VNNN in Simbad)meta.id;meta.maincharMJDModified Julian Datedtime.epochdoubleindexedgimagApparent magnitude in g or i bandmagphot.magfloate_gimagError on gimagmagstat.error;phot.magfloatFilter[gi] Filter used for the observationinstr.setup;instr.filterchar