J/ApJ/647/1075ivo://CDS.VizieR/J/ApJ/647/1075doi:10.26093/cds/vizier.16471075CDSStanford L.M.Da Costa G.S.Norris J.E.Cannon R.D.2008-08-16T05:45:40Z2008-08-16T05:42:38ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvisible-astronomybroad-band-photometryradial-velocitymetallicityWe present a metallicity distribution based on photometry and spectra for 442 Omega Centauri cluster members that lie at the main-sequence turnoff region of the color-magnitude diagram. This distribution is similar to that found for the red giant branch. The distribution shows a sharp rise to a mean of [Fe/H]=-1.7 with a long tail to higher metallicities. Ages have then been determined for the stars using theoretical isochrones enabling the construction of an age-metallicity diagram. Interpretation of this diagram is complicated by the correlation of the errors in the metallicities and ages. Nevertheless, after extensive Monte Carlo simulations, we conclude that our data show that the formation of the cluster took place over an extended period of time: the most metal-rich stars in our sample ([Fe/H]~-0.6) are younger by 2-4Gyr than the most metal-poor population.2006ApJ...647.1075Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/647/1075CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/250/314 : CCD photometry of omega Cen (Noble+ 1991)J/PASP/106/828 : BVRI photometry of Omega Cen (Walker 1994)J/AJ/114/1087 : Omega Cen radial velocities (Mayor+ 1997)J/AJ/127/958 : CCD BV photometry on Omega Cen (Rey+, 2004)J/A+A/445/503 : Radial velocities in Omega Cen (NGC5139) (Reijns+, 2006)J/AJ/135/1395 : omega Cen Spitzer photometry (Boyer+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/647/1075https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/647/1075http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/647/1075https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/647/1075https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/647/1075http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/647/1075GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/647/1075/table2 (omega Cen Members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/647/1075/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/647/1075/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/647/1075/table2?GETtext/xml+votable180.050000true201.4554167-47.259750.005555555555555556Cone search capability for table J/ApJ/647/1075/table3 (Non-Members in the 2002 observing box)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/647/1075/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/647/1075/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/647/1075/table3?GETtext/xml+votable180.050000true202.195875-47.58011110.0055555555555555566/43225 43227 43228 43230 43249https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/647/1075?format=asciiOpticaldefaultJ/ApJ/647/1075/table2omega Cen MembersAgeStellar AgeGyrtime.agefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDNObject identification number, CL* NGC 5139 SDN NNNNNNN in Simbadmeta.id;meta.mainintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainVmagThe V band magnitudemagphot.mag;em.opt.VfloatB-VThe (B-V) color indexmagphot.color;em.opt.B;em.opt.VfloatHRVHeliocentic radial velocitykm/sspect.dopplerVelocint[Fe/H]The [Fe/H] abundancephys.abund.Fefloate_[Fe/H]The 1{sigma} error in [Fe/H]stat.error;phys.abund.Fefloate_AgeThe 1{sigma} error in AgeGyrstat.error;time.agefloatRunObservation run (1=1998/1999, 2=2002)obs.param;obscharJ/ApJ/647/1075/table3Non-Members in the 2002 observing boxrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDNObject identification number, CL* NGC 5139 SDN NNNNNNN in Simbadmeta.id;meta.mainintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainVmagThe V band magnitudemagphot.mag;em.opt.VfloatB-VThe (B-V) color indexmagphot.color;em.opt.B;em.opt.VfloatHRVHeliocentic radial velocitykm/sspect.dopplerVelocfloatRunObservation run (1=1998/1999, 2=2002)obs.param;obschar