J/AJ/119/1760ivo://CDS.VizieR/J/AJ/119/1760doi:10.26093/cds/vizier.51191760CDSLayden A.C.Sarajedini A.2023-04-06T16:50:37Z2004-06-26T19:10:34ZCDS support team

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

cds-question@unistra.frglobular-star-clustersgalaxiesphotometryvariable-starsWe present deep VI-band photometry of the globular cluster M54, a nearby field in the Sagittarius dwarf galaxy, and a control field. The color-magnitude diagrams reach well below the oldest main-sequence turnoffs, thus enabling an analysis of the galaxy's age-metallicity relation with unprecedented clarity. We also study the variable stars in the direction of M54. From 67 RR Lyrae variables, we confirm and improve on our previous estimates of the cluster horizontal branch magnitude, foreground reddening, and horizontal branch morphology. These values are used in determining the ages of M54 and the Sagittarius field populations. We confirm our previous result that M54 is the same age as Galactic globular clusters of similar metallicity.2000AJ....119.1760Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/119/1760CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AJ/109/1086 : VI Photometry in M54 and Sgr Dwarf Galaxy (Sarajedini+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/119/1760https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/119/1760http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/119/1760https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/119/1760https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/119/1760http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/119/1760GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/119/1760/table2Photometry of M54 from shallow framesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification number (1)meta.id;meta.mainintXposX position (2)pixpos.cartesian.x;instr.detfloatYposY position (2)pixpos.cartesian.y;instr.detfloatVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.errorfloatImagI magnitudemagphot.mag;em.opt.Ifloate_Imagrms uncertainty on Vmagmagstat.errorfloatNobsNumber of observationsmeta.numberintJ/AJ/119/1760/table3Photometry of M54 from deep framesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification number (1)meta.id;meta.mainintXposX position (2)pixpos.cartesian.x;instr.detfloatYposY position (2)pixpos.cartesian.y;instr.detfloatVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.errorfloatImagI magnitudemagphot.mag;em.opt.Ifloate_Imagrms uncertainty on Vmagmagstat.errorfloatNobsNumber of observationsmeta.numberintJ/AJ/119/1760/table4Photometry of Sagittarius from shallow framesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification number (1)meta.id;meta.mainintXposX position (2)pixpos.cartesian.x;instr.detfloatYposY position (2)pixpos.cartesian.y;instr.detfloatVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.errorfloatImagI magnitudemagphot.mag;em.opt.Ifloate_Imagrms uncertainty on Vmagmagstat.errorfloatNobsNumber of observationsmeta.numberintJ/AJ/119/1760/table5Photometry of Sagittarius from deep framesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification number (1)meta.id;meta.mainintXposX position (2)pixpos.cartesian.x;instr.detfloatYposY position (2)pixpos.cartesian.y;instr.detfloatVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.errorfloatImagI magnitudemagphot.mag;em.opt.Ifloate_Imagrms uncertainty on Vmagmagstat.errorfloatNobsNumber of observationsmeta.numberintJ/AJ/119/1760/table6Photometry of the control fieldNobsNumber of observationsmeta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification number (1)meta.id;meta.mainintXposX position (2)pixpos.cartesian.x;instr.detfloatYposY position (2)pixpos.cartesian.y;instr.detfloatVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.errorfloatImagI magnitudemagphot.mag;em.opt.Ifloate_Imagrms uncertainty on Vmagmagstat.errorfloatJ/AJ/119/1760/table8Mean photometry of suspected variable starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVarVariable Star designation (1)meta.idcharXposX position (G1)pixpos.cartesian.x;instr.detfloatYposY position (G1)pixpos.cartesian.y;instr.detfloat<Vmag>Mean V magnitudemagphot.mag;em.opt.Vfloat<V-I>Mean V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatDVmagAmplitude in V magnitudemagphot.mag;arith.difffloatComCommentsmeta.notecharJ/AJ/119/1760/table9Photometric properties of short-period variable starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVarVariable star designation <Cl* NGC 6715 Saw VNNN> in Simbadmeta.idcharXposX position (G1)pixpos.cartesian.x;instr.detfloatYposY position (G1)pixpos.cartesian.y;instr.detfloatPerPerioddtime.perioddoubleTypeVariablity typemeta.code;src.varchar<Vmag>Intensity-mean V magnitudemagphot.mag;em.opt.Vfloat<Imag>? Intensity-mean I magnitudemagphot.mag;em.opt.IfloatnullableVmaxMaximum V magnitudemagphot.mag;em.opt.VfloatVminMinimum V magnitudemagphot.mag;em.opt.VfloatEmaxEpoch of maximum light (JD)dtime.epochdoubleNobsNumber of observations in V framemeta.numberintNtmpTemplate number used in the adopted fitstat.fit.paramintrmsroot-mean-squared scatter of the data points about the fitmagstat.errorfloat(V-I)minMagnitude-mean (V-I) colour at minimum lightmagphot.color;em.opt.V;em.opt.Ifloate_(V-I)min? rms uncertainty on (V-I)minmagstat.errorfloatnullableNminNumber of observations used in its computationmeta.numberintNote[*] Note detailed in notes.dat filemeta.notecharJ/AJ/119/1760/table10Mean photometry of long-period variable starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVarVariable Star designation (1)meta.idcharXposX position (G1)pixpos.cartesian.x;instr.detfloatYposY position (G1)pixpos.cartesian.y;instr.detfloat<Vmag>Mean V magnitudemagphot.mag;em.opt.Vfloat<V-I>Mean V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatDVmagAmplitude in V magnitudemagphot.mag;arith.difffloatComCommentsmeta.notecharJ/AJ/119/1760/table11Mean photometry of faint variable starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVarVariable Star designation (1)meta.idcharXposX position (G1)pixpos.cartesian.x;instr.detfloatYposY position (G1)pixpos.cartesian.y;instr.detfloat<Vmag>Mean V magnitudemagphot.mag;em.opt.Vfloat<V-I>Mean V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatDVmagAmplitude in V magnitudemagphot.mag;arith.difffloatComCommentsmeta.notecharJ/AJ/119/1760/notesIndividual notes of table9.datrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVarVariable star designationmeta.idcharNoteText of the notemeta.notechar