J/MNRAS/420/1333ivo://CDS.VizieR/J/MNRAS/420/1333doi:10.26093/cds/vizier.74201333CDSArellano Ferro A.Bramich D.M.Figuera Jaimes R.Giridhar S.,Kuppuswamy K.2024-07-16T20:12:29Z2013-02-01T16:03:46ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvariable-starsinfrared-photometryvisible-astronomybroad-band-photometryWe report the discovery of amplitude and phase modulations typical of the Blazhko effect in 22 RRc and nine RRab type RR Lyrae stars in NGC 5024 (M53). This brings the confirmed Blazhko variables in this cluster to 23 RRc and 11 RRab stars, which represent 66 and 37 per cent of the total population of RRc and RRab stars in the cluster, respectively, making NGC 5024 the globular cluster with the largest presently known population of Blazhko RRc stars. We place a lower limit of 52 per cent on the overall incidence rate of the Blazhko effect among the RR Lyrae population in this cluster. New data have allowed us to refine the pulsation periods. The limitations imposed by the time span and sampling of our data prevent reliable estimations of the modulation periods. The amplitudes of the modulations range between 0.02 and 0.39mag. The RRab and RRc are neatly separated in the colour-magnitude diagram, and the RRc Blazhko variables are on average redder than their stable counterparts; these two facts may support the hypothesis that the horizontal branch (HB) evolution in this cluster is towards the red and that the Blazhko modulations in the RRc stars are connected with the pulsation mode switch.2012MNRAS.420.1333Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/420/1333CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/116/1775 : BV photometry of M53 (Rey+, 1998)J/PAZh/23/454 : Identification and coordinates in M 53 (Evstigneeva+, 1997)J/A+A/358/547 : M53 variable stars V light curves (Kopacki, 2000)J/A+A/507/803 : VI photometry of new M53 variables (Dekany+, 2009)J/MNRAS/416/2265 : Variable stars in NGC 5024 (M53) (Arellano+, 2011)J/MNRAS/424/2722 : Variable stars in NGC 5024 (M53) (Bramich+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/420/1333https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/420/1333http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/420/1333https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/420/1333https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/420/1333http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/420/1333GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/420/1333/table2 (Periods and epochs of the RR Lyrae stars in NGC 5024 in our field of view)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/420/1333/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/420/1333/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/420/1333/table2?GETtext/xml+votable180.050000true198.2347518.12055560.0055555555555555566/27975 27981 27992https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/420/1333?format=asciiOpticalInfrareddefaultJ/MNRAS/420/1333/table2Periods and epochs of the RR Lyrae stars in NGC 5024 in our field of viewrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLClight curvemeta.ref.urlcharVNameVariable star name, <Cl* NGC 5024 SAW VNN> in Simbadmeta.id;meta.maincharprimaryn_VName[*] Flux contamination (1)meta.notecharTypeBailey's type (2)src.classcharPerPerioddtime.perioddoubleHJDmaxMaximum brightness HJD (HJD-2400000)dtime.epoch;stat.maxdoubleSimbadSimbad column added by the CDSmeta.refchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/420/1333/table6Phase and magnitude at the time of maximum brightness in the V band for a group of stars with Blazhko modulationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVNameVariable star namemeta.id;meta.maincharphimax[0/1] Phase at maximum brightnesstime.phasefloatVmaxV magnitude at maximum brightnessmagphot.mag;em.opt.VfloatHJDmaxMaximum brightness HJD (HJD-2450000)dtime.epoch;stat.maxdoubleJ/MNRAS/420/1333/table1Time series V and I photometry for all the RR Lyrae stars in our field of viewrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVNameVariable star namemeta.id;meta.maincharFilter[VI] Observation filterobs.param;obscharHJDHeliocentric Julian date at mid-exposuredtime.epochdoublemagstStandard magnitudemagphot.magfloatmaginstInstrumental magnitudemagphot.magfloate_maginstMagnitude uncertainty (standard or instrumental)magstat.errorfloatFrefReference flux (in ADU/s unit) (1)s**-1phot.flux.density;em.optdoublee_FrefReference flux uncertainty (in ADU/s unit)s**-1stat.errorfloatDFluxDifference flux (in ADU/s unit) (1)s**-1phot.flux;arith.ratiodoublee_DFluxDifference flux uncertainty (in ADU/s unit)s**-1stat.errorfloatpPhotometric scale factor (1)arith.factorfloat