J/ApJ/663/296ivo://CDS.VizieR/J/ApJ/663/296doi:10.26093/cds/vizier.16630296CDSVillanova S.Piotto G.King I.R.Anderson J.Bedin L.R.Gratton R.G.,Cassisi S.Momany Y.Bellini A.Cool A.M.Recio-Blanco A.Renzini A.2009-09-27T22:10:32Z2009-09-27T22:03:43ZCDS support team

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

cds-question@unistra.frglobular-star-clustersgiant-starshst-photometryinfrared-photometryvisible-astronomybroad-band-photometryWe combine spectroscopic and photometric data for subgiant stars of {omega} Cen to extract results that neither data set could have provided on its own. GIRAFFE@VLT spectra of 80 stars at R=6400 give metallicities for all of them and abundances of C, N, Ca, Ti, and Ba for a subset of them. The photometric data, which have unusually high accuracy, come from a ~10x10arcmin^2^ mosaic of HST ACS images centered on the cluster center and on multicolor images of a ~34x33arcmin^2^ field, taken with the WFI@ESO2.2m camera. Stars with [Fe/H]<-1.25 have a large magnitude spread on the flat part of the sub-giant branch (SGB). We interpret this as empirical evidence for an age spread, and from theoretical isochrones we derive a relative age for each star.2007ApJ...663..296Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/663/296CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/108/1350 : Omega Cen FUV photometry (Whitney+, 1994)J/AJ/114/1087 : Omega Cen radial velocities (Mayor+ 1997)J/AJ/119/1225 : Stroemgren photometry of Omega Cen & NGC 6397 (Hughes+ 2000)J/AJ/119/1824 : Caby photometry of {Omega} Centauri (Rey+, 2000)J/A+A/400/521 : Omega Cen XMM observations (Gendre+, 2003)J/A+A/420/173 : JK photometry of Omega Cen red giants (Sollima+, 2004)J/AJ/127/980 : vby and BVI photometry of Omega Cen giants (Hughes+, 2004)J/MNRAS/357/265 : BVI photometry of omega Cen red giants (Sollima+, 2005)J/ApJ/661/L155 : Radial velocities Rgb stars in omega Cen (Pancino+, 2007)J/A+A/445/503 : Radial velocities in Omega Cen (NGC5139) (Reijns+, 2006)J/ApJ/654/915 : Deep FORS1 BR photometry of omega Cen (Sollima+, 2007)J/MNRAS/382/1353 : Spectral atlas of omega Cen post-MS stars (Van Loon+, 2007)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/663/296https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/663/296http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/663/296https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/663/296https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/663/296http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/663/296GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/663/296/table1 (Stars observed at HST)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/663/296/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/663/296/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/663/296/table1?GETtext/xml+votable180.050000true201.58901889-47.535166940.005555555555555556Cone search capability for table J/ApJ/663/296/table2 (Stars observed at WFI)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/663/296/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/663/296/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/663/296/table2?GETtext/xml+votable180.050000true201.66425806-47.652603890.0055555555555555566/43225 43227https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/663/296?format=asciiOpticalInfrareddefaultJ/ApJ/663/296/table1Stars observed at HSTrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPKDSequential number, Cl* NGC 5139 PKD NNNNN in Simbadmeta.id;meta.mainintRAJ2000Right ascension in decimal degrees (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000.0)degpos.eq.dec;meta.mainF435WHST F435W magnitudemagphot.mag;em.opt.BfloatF435W-F625WHST F435W-F625W colour indexmagphot.color;em.opt.B;em.opt.RfloatVmagJohnson V magnitudemagphot.mag;em.opt.VfloatHRVHeliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricintTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloatJ/ApJ/663/296/table2Stars observed at WFIHRVHeliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPKDSequential number, Cl* NGC 5139 PKD NNNNN in Simbadmeta.id;meta.mainintRAJ2000Right ascension in decimal degrees (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000.0)degpos.eq.dec;meta.mainVmagJohnson V magnitudemagphot.mag;em.opt.VfloatB-VJohnson B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatV-IcJohnson-Cousins V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatV-RcJohnson-Cousins V-R colour indexmagphot.color;em.opt.V;em.opt.RfloatTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H]Metallicityphys.abund.ZfloatAgeEstimated ageGyrtime.agefloat