J/ApJ/706/1277ivo://CDS.VizieR/J/ApJ/706/1277doi:10.26093/cds/vizier.17061277CDSCalamida A.Bono G.Stetson P.B.Freyhammer L.M.Piersimoni A.M.,Buonanno R.Caputo F.Cassisi S.Castellani M.Corsi C.E.Dall'Ora M.,Degl'Innocenti S.Ferraro I.Grundahl F.Hilker M.Iannicola G.,Monelli M.Nonino M.Patat N.Pietrinferni A.Prada Moroni P.G.,Primas F.Pulone L.Richtler T.Romaniello M.Storm J.Walker A.R.2026-05-19T14:25:37Z2012-01-19T08:49:09ZCDS support team

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

cds-question@unistra.frglobular-star-clustersvisible-astronomymedium-band-photometryinfrared-photometryWe present new intermediate-band Stromgren photometry based on more than 300 u, v, b, y images of the Galactic globular cluster {omega} Cen. Optical data were supplemented with new multiband near-infrared (NIR) photometry (350 J, H, Ks images). The final optical-NIR catalog covers a region of more than 20x20arcmin squared across the cluster center. We use different optical-NIR color-color planes together with proper-motion data available in the literature to identify candidate cluster red-giant (RG) stars. By adopting different Stromgren metallicity indices, we estimate the photometric metallicity for ~4000 RGs, the largest sample ever collected. We identify four distinct subpopulations, namely, MP ([Fe/H]<=-1.49), metal-intermediate (MI; -1.49<[Fe/H]<=-0.93), metal-rich (MR; -0.95<[Fe/H]<=-0.15), and solar metallicity ([Fe/H]~0). The last group includes only a small fraction of stars (~8%+/-5%) and should be confirmed spectroscopically. Moreover, using the difference in metallicity based on different photometric indices, we find that the 19%+/-1% of RGs are candidate CN-strong stars.2009ApJ...706.1277Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/706/1277CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/698/2048 : Abundances of red giants in {omega} Cen (Johnson+, 2009)J/MNRAS/396/2183 : Radial velocities of red giants in {omega} Cen (Sollima+J/MNRAS/357/265 : BVI photometry of omega Cen red giants (Sollima+, 2005)J/A+A/420/173 : JK photometry of Omega Cen red giants (Sollima+, 2004)J/AJ/127/1227 : Synthetic Stroemgren photometry (Clem+, 2004)J/AJ/119/1225 : Stroemgren photometry of Omega Cen and NGC 6397 (Hughes+,J/A+AS/104/429 : uvby Photometry of G-type dwarfs (Olsen 1994)J/A+AS/102/89 : uvby-beta Photometry of G5 stars (Olsen 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/706/1277https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/706/1277http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/706/1277https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/706/1277https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/706/1277http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/706/1277GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/706/1277/table7 (Set of Stroemgren standard stars observed by F. Grundahl (FG))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/706/1277/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/706/1277/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/706/1277/table7?GETtext/xml+votable180.050000true193.4249056-23.10919560.0055555555555555566/4265 5283 16565 17099 17136 17280 18561 18605 18968 18990 19033 19090 19113 21269 24642 24862 25051 25788 26030 26366 27190 27331 28690 28882 28900 28916 29036 29490 29548 30090 30100 30903 30939 31368 31481 31576 37191 37232 37713 38164 38259 38628 38778 38871 40567 41384 41460 41580 41657 41702 41721 41734 41979 42029 42331 42366 42405 42498 42595 42697-42698 42910 43068 43088 43306 43365 43458 43534 43575 43786 43788 43823 43962 44106 44208 44248 44281 44368 44501 44694 44862 44910 45679 45682 46909 46936 46959 47147 47781 47824 47914 47930 48040 48045 48088 48603 48697-48698 48731 48879 48993https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/706/1277?format=asciiOpticalInfrareddefaultJ/ApJ/706/1277/obslogLog of scientific CCD images of {omega} Cen collected by L. Freyhammer (central field), F. Grundahl (SW fields), M. Hilker (see fields in Figure 1), and near-IRrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRunObservation run identificationmeta.id;obs.param;obscharFrameFrame identificationmeta.id;pos.frame;obs.fieldcharFieldField identificationmeta.id;obs.fieldcharDateUT Day of the observationtime.epoch;obsnullableHJDHeliocentric Julian Datedtime.epochdoubleExpIndividual exposure time (G2)stime.duration;obs.exposureintFiltStromgren or near-IR filter used (G1)meta.notecharSeeIndividual seeingarcsecinstr.obsty.seeingfloatJ/ApJ/706/1277/table7Set of Stroemgren standard stars observed by F. Grundahl (FG)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (1)meta.id;meta.maincharprimarySSimbad column added by the CDSmeta.ref.urlcharDateUT Day of the observation (2)time.epoch;obsnullableFilt[u,v,b,y] Filter used (u,v,b,y together)instr.setup;instr.filtercharSimbadSimbad column added by the CDSchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.mainJ/ApJ/706/1277/table8Log of standard stars of the reference photometric nightrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (1)meta.id;meta.maincharHJDHeliocentric Julian Datedtime.epochdoubleExpIndividual exposure timestime.duration;obs.exposureintFilt[buvy] Filter used (Stromgren b,u,v or y)instr.setup;instr.filterchar