J/ApJ/297/582ivo://CDS.VizieR/J/ApJ/297/582doi:10.26093/cds/vizier.12970582CDSDa Costa G.S.Mould J.R.Crawford M.D.1997-12-09T19:45:35Z1997-12-09T20:45:30ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsglobular-star-clustersccd-photometryThe age of the LMC red globular cluster NGC 2213 has been estimated as 1.3+/-0.5x10^9^yr from a color-magnitude diagram, derived from CCD photometry, that reveals the cluster main sequence. The accuracy of the age estimate, however, is limited by uncertainly in the LMC distance modulus, by uncertainty in the cluster metal abundance which appears to lie in the range one-half to one-sixth solar, by uncertainty in the reddening of the cluster, and by uncertainty in the extent to which the theoretical isochrones used for the age dating are affected by the neglect, in standard stellar models, of the interior mixing caused by convective overshoot in the stellar cores. Using the adopted reddening of E(B-V)=0.09 and assuming Y=0.2, isochrone best fits to the cluster main sequence are found for [M/H]=-0.3 if (m-M)0=18.7 and for [M/H]=-0.7 if (m-M)0=18.2. After allowance for the possible effects of convective overshoot, the corresponding ages are 0.9^+0.5^_-0.3_ and 1.6^+0.8_^-0.4_x10^9^yr. Plausible alterations in the adopted reddening value and the adopted helium abundance also yield ages within these limits.1985ApJ...297..582Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/297/582CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/297/582https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/297/582http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/297/582https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/297/582https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/297/582http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/297/582GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/297/582/table2NGC 2213 cluster photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar numbermeta.id;meta.mainintRmagR magnitudemagphot.mag;em.opt.RfloatB-RB- R color indexmagphot.color;em.opt.B;em.opt.RfloatXposX position (1)pixpos.cartesian.x;instr.detintYposY position (1)pixpos.cartesian.y;instr.detintIdCross-Identification (only in table4) (2)meta.id.crosscharJ/ApJ/297/582/table3NGC 2213 field star photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar numbermeta.id;meta.mainintRmagR magnitudemagphot.mag;em.opt.RfloatB-RB- R color indexmagphot.color;em.opt.B;em.opt.RfloatXposX position (1)pixpos.cartesian.x;instr.detintYposY position (1)pixpos.cartesian.y;instr.detintIdCross-Identification (only in table4) (2)meta.id.crosscharJ/ApJ/297/582/table4NGC 2213 photometry from short-exposure framesRmagR magnitudemagphot.mag;em.opt.RfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar numbermeta.id;meta.mainintB-RB- R color indexmagphot.color;em.opt.B;em.opt.RfloatXposX position (1)pixpos.cartesian.x;instr.detintYposY position (1)pixpos.cartesian.y;instr.detintIdCross-Identification (only in table4) (2)meta.id.crosschar