J/MNRAS/468/870ivo://CDS.VizieR/J/MNRAS/468/870doi:10.26093/cds/vizier.74680870CDSTanakul N.Yang S.-C.Sarajedini A.2024-08-17T20:18:56Z2020-01-31T12:17:02ZCDS support team

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

cds-question@unistra.frgalaxiesvariable-starsinfrared-photometryvisible-astronomyphotometryWe present a re-analysis of M33 RR Lyrae variables in four different fields: two inner disc fields and two outer disc fields. These are located at 8.5, 8.7, 36 and 46 arcmin from the centre of M33, respectively. We identify 48 new RR Lyrae variable stars and refine the light-curve properties of 51 previously identified variables. From the light curves, we calculate reddenings and metallicities for each star. Using data in this paper and previously published material, we are able to construct a radial density profile for the RR Lyrae stars in M33. This profile, when plotted in log space, has a slope of ~-2.0+/-0.15 which agrees with the radial distribution of halo stars in the Milky Way and M31. This suggests that the majority of M33 RR Lyrae variables observed so far belong to the halo. We also examine the RR Lyrae specific frequency and absolute magnitude relation in M33 and find good agreement with previous studies.2017MNRAS.468..870Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/468/870CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/132/1361 : RR Lyrae variables in M33 (Sarajedini+, 2006)J/ApJ/724/799 : RR Lyrae variables in M33. II. (Yang+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/468/870https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/468/870http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/468/870https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/468/870https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/468/870http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/468/870GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/468/870/table11 (RRL properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/468/870/table11?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/468/870/table11?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/468/870/table11?GETtext/xml+votable180.050000true23.738541731.21480560.0055555555555555566/2155 2241https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/468/870?format=asciiOpticalInfrareddefaultJ/MNRAS/468/870/table11RRL propertiesPerPerioddtime.periodfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLCShow the light curvesmeta.ref.urlcharField[ F1 M9 U49] Field nameobs.fieldcharInst[WFC1 WFC2] Instrumentmeta.id;instrcharNameStar name, VNNNNNNmeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.main<Vmag>Mean V magnitudemagphot.mag;em.opt.Vfloat<Imag>Mean I magnitudemagphot.mag;em.opt.Ifloat<V-I>Mean V-I colour indexmagphot.color;em.opt.V;em.opt.Ifloate_Perrms uncertainty on Perdstat.errorfloatIAmpAmplitude of variation in I bandmagarith.rate;phot.magfloate_IAmprms uncertainty on IAmpmagstat.errorfloatTypeRR Lyrae typemeta.notecharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/MNRAS/468/870/photometryTime-series photometry of variable stars in F1 field (table 4), M9 (table 5) and U49 (table 6) RRLsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintField[F1 M9 U49] Field nameobs.fieldcharInst[WFC1 WFC2] Instrumentmeta.id;instrcharFilt[VI] Filtermeta.id;instr.filtercharHJDEpoch (HJD-2450000)dtime.epochdoublemagMagnitude in filtermagphot.magfloate_magrms uncertainty in magmagstat.error;phot.magfloatNameStar name, VNNNNNNmeta.id;meta.mainchar