J/PASP/126/521ivo://CDS.VizieR/J/PASP/126/521doi:10.26093/cds/vizier.61260521CDSStetson P.B.Braga V.F.Dall'Ora M.Bono G.Buonanno R.Ferraro I.,Iannicola G.Marengo M.Neeley J.2025-09-09T14:14:37Z2014-12-08T09:47:07ZCDS support team

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

cds-question@unistra.frvariable-starsinfrared-photometryvisible-astronomybroad-band-photometryWe present optical and near-infrared UBVRIJHK photometry of stars in the Galactic globular cluster M4 (NGC 6121) based upon a large corpus of observations obtained mainly from public astronomical archives. We concentrate on the RR Lyrae variable stars in the cluster, and make a particular effort to accurately reidentify the previously discovered variables. We have also discovered two new probable RR Lyrae variables in the M4 field: one of them by its position on the sky and its photometric properties is a probable member of the cluster, and the second is a probable background (bulge?) object. We provide accurate equatorial coordinates for all 47 stars identified as RR Lyraes, new photometric measurements for 46 of them, and new period estimates for 45. We have also derived accurate positions and mean photometry for 34 more stars previously identified as variable stars of other types, and for an additional five non-RR Lyrae variable stars identified for the first time here. We present optical and near-infrared color-magnitude diagrams for the cluster and show the locations of the variable stars in them. We present the Bailey (period-amplitude) diagrams and the period-frequency histogram for the RR Lyrae stars in M4 and compare them to the corresponding diagrams for M5 (NGC 5904). We conclude that the RR Lyrae populations in the two clusters are quite similar in all the relevant properties that we have considered. The mean periods, pulsation-mode ratios, and Bailey diagrams of these two clusters show support for the recently proposed "Oosterhoff-neutral" classification.2014PASP..126..521Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASP/126/521CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASP/126/521https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASP/126/521http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASP/126/521https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASP/126/521https://vizier.iucaa.in/viz-bin/votable?-source=J/PASP/126/521http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASP/126/521GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/PASP/126/521/RR_Lyr (Positions, periods (table3), mean optical magnitudes and amplitudes (table4), and mean NIR magnitudes and amplitudes (table5) for the RR Lyrae variables in M4)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASP/126/521/RR_Lyr?https://vizier.iucaa.in/viz-bin/conesearch/J/PASP/126/521/RR_Lyr?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASP/126/521/RR_Lyr?GETtext/xml+votable180.050000true245.8069583-26.51488890.005555555555555556Cone search capability for table J/PASP/126/521/other_var (Positions, mean optical photometry (table6) and mean infrared photometry (table7) for other candidate variable stars in M4)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASP/126/521/other_var?https://vizier.iucaa.in/viz-bin/conesearch/J/PASP/126/521/other_var?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASP/126/521/other_var?GETtext/xml+votable180.050000true245.810125-26.60150.0055555555555555566/42955 429777.952274030004205e-20 6.118840631666147e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/PASP/126/521?format=asciiOpticalInfrareddefaultJ/PASP/126/521/RR_LyrPositions, periods (table3), mean optical magnitudes and amplitudes (table4), and mean NIR magnitudes and amplitudes (table5) for the RR Lyrae variables in M4TypeType of RR Lyrae (RRab or RRc) (6)meta.code;src.varcharRmag? Mean R magnitude (4)magphot.mag;em.opt.RfloatnullableImag? Mean I magnitude (4)magphot.mag;em.opt.IfloatnullableUamp? Luminosity amplitude in U band (5)magsrc.var.amplitudefloatnullableBamp? Luminosity amplitude in B band (5)magsrc.var.amplitudefloatnullableVamp? Luminosity amplitude in V band (5)magsrc.var.amplitudefloatnullableRamp? Luminosity amplitude in R band (5)magsrc.var.amplitudefloatnullableIamp? Luminosity amplitude in I band (5)magsrc.var.amplitudefloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRmeta.ref.urlcharIDStar designation (VNN or CN)meta.id;meta.maincharprimaryn_ID[c] Missing data (1)meta.notecharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainPer1? Pulsation period from Clement et al. (2001AJ....122.2587C) compilationdtime.periodfloatnullablePer2? Pulsation period based on our current data using the string-length method (SL)dtime.perioddoublenullablePer3? Pulsation period based on our current data using the Lomb-Scargle method (LS)dtime.perioddoublenullableT0? Epoch of maximum (HJD-2400000) (2)dtime.epochdoublenullablen_Per[ef] Note on Period (G1)meta.notecharPerPulsation period based on the LS methoddtime.perioddoubleUmagMean U magnitude (4)magphot.mag;em.opt.UfloatBmagMean B magnitude (4)magphot.mag;em.opt.BfloatVmagMean V magnitude (4)magphot.mag;em.opt.Vfloatn_Type[*] * for variables that are candidate Blazhko variablesmeta.notecharJmag? Mean J magnitude (2)magphot.mag;em.IR.JfloatnullableHmag? Mean H magnitude (2)magphot.mag;em.IR.HfloatnullableKmag? Mean K magnitude (2)magphot.mag;em.IR.KfloatnullableJamp? Luminosity amplitude in J band (3)magsrc.var.amplitudefloatnullableHamp? Luminosity amplitude in H band (3)magsrc.var.amplitudefloatnullableKamp? Luminosity amplitude in K band (3)magsrc.var.amplitudefloatnullableSimbadNameSimbad column added by the CDSmeta.idcharJ/PASP/126/521/notesIndividual notes on RR Lyrae variablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar designation (VNN or CN)meta.id;meta.maincharNoteText of the notemeta.notecharJ/PASP/126/521/other_varPositions, mean optical photometry (table6) and mean infrared photometry (table7) for other candidate variable stars in M4recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar designation (VNN, KNN or CN)meta.id;meta.maincharn_ID[*] Note on K58 (1)meta.notecharONameOther name (G2)meta.idcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainUmag? Mean U magnitudemagphot.mag;em.opt.UfloatnullableBmag? Mean B magnitudemagphot.mag;em.opt.BfloatnullableVmag? Mean V magnitudemagphot.mag;em.opt.VfloatnullableRmag? Mean R magnitudemagphot.mag;em.opt.RfloatnullableImag? Mean I magnitudemagphot.mag;em.opt.IfloatnullablePer? Perioddtime.perioddoublenullablen_Per[a] Note on Per (2)meta.notecharCom6Comments on optical photometrymeta.notecharJmagMean J magnitudemagphot.mag;em.IR.JfloatHmagMean H magnitudemagphot.mag;em.IR.HfloatKmagMean K magnitudemagphot.mag;em.IR.KfloatCom7Comments on IR photometrymeta.notechar