J/other/RMxAA/40ivo://CDS.VizieR/J/other/RMxAA/40.209CDSArellano Ferro A.Arevalo M.J.Lazaro C.Rey M.Bramich D.M.,Giridhar S.2017-12-18T07:57:43Z2013-01-29T12:08:42ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvariable-starsccd-photometryWe report the results of CCD V and R photometry of the RR Lyrae stars known in NGC 4147. The periodicities of most variables are revised and new ephemerides are calculated. The Blazhko effect has been detected in V2 and V6. Three previously reported variables; V5, V9, and V15 are found to be non-variable. A new variable V18 was discovered with a period of 0.49205-days and an amplitude of 0.15mag. Using the approach of Fourier decomposition of the light curves, the physical parameters of the RRab and RRc variables were estimated. The cluster is of the Oosterhoff type I. With the newly values [Fe/H]=-1.22+/-0.31 and 16.8+/-1.3kpc, the cluster fits very well into the Oosterhoff type-metallicity and metallicity-temperature sequence found in globular clusters. A comparison with ZAHB models indicates that the RRab stars have not yet evolved off the horizontal branch, a result consistent with the mean period of the RRab variables and with the metallicity of the cluster derived in this work.2004RMxAA..40..209Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/RMxAA/40.209CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/RMxAA/40.209https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/RMxAA/40.209http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/RMxAA/40.209https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/RMxAA/40.209https://vizier.iucaa.in/viz-bin/votable?-source=J/other/RMxAA/40.209http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/RMxAA/40.209GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/other/RMxAA/40.209/table3 (Update of periods, epochs, and amplitudes for the RR Lyrae stars in NGC 4147)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/RMxAA/40.209/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/other/RMxAA/40.209/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/RMxAA/40.209/table3?GETtext/xml+votable180.050000true182.49737518.53011110.0055555555555555566/28067https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/RMxAA/40.209?format=asciiOpticaldefaultJ/other/RMxAA/40.209/table3Update of periods, epochs, and amplitudes for the RR Lyrae stars in NGC 4147recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVnoVariable name (VNN), Cl* NGC 4147 SAW VNN in Simbadmeta.id;meta.maincharprimaryType[ab c] Type of RR Lyrae variablemeta.code;src.varcharOPer? Old perioddtime.perioddoublenullableu_OPerUncertainty flag on OPermeta.code.errorcharn_OPer[pnv] "pnv" for "probably not variable"meta.notecharPer? New Perioddtime.perioddoublenullablen_Per[nv] "nv" for "not variable"meta.notecharT0? Epoch of maximum light (JD-2400000)dtime.epochdoublenullableVamp? Amplitude in V bandmagphot.mag;em.opt.Vfloatnullablen_Vamp[a] Blazhko effect (1)meta.notecharRamp? Amplitude in R bandmagphot.mag;em.opt.Rfloatnullablen_Ramp[a] Blazhko effect (1)meta.notecharLCPlot of light curvesmeta.ref.urlcharSimbadSimbad 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/other/RMxAA/40.209/varphotCCD time-series V and R photometry of 15 variables in NGC 4147recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVnoVariable name (VNN)meta.id;meta.maincharFilter[VR] Observation filterobs.param;obscharHJDHeliocentric Julian date at mid-exposuredtime.epochdoublemagstStandard magnitude in Filtermagphot.magfloat