J/ApJ/731/64ivo://CDS.VizieR/J/ApJ/731/64doi:10.26093/cds/vizier.17310064CDSMarino A.F.Milone A.P.Piotto G.Villanova S.Gratton R.D'Antona F.,Anderson J.Bedin L.R.Bellini A.Cassisi S.Geisler D.Renzini A.,Zoccali M.2017-10-11T05:13:06Z2012-11-21T09:35:54ZCDS support team

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

cds-question@unistra.frmetallicitygiant-starsglobular-star-clustersOmega Centauri is no longer the only globular cluster known to contain multiple stellar populations, yet it remains the most puzzling. Due to the extreme way in which the multiple stellar population phenomenon manifests in this cluster, it has been suggested that it may be the remnant of a larger stellar system. In this work, we present a spectroscopic investigation of the stellar populations hosted in the globular cluster {omega} Centauri to shed light on its still puzzling chemical enrichment history. With this aim, we used FLAMES+GIRAFFE@VLT to observe 300 stars distributed along the multimodal red giant branch of this cluster, sampling with good statistics the stellar populations of different metallicities. We determined chemical abundances for Fe, Na, O, and n-capture elements Ba and La. We confirm that {omega} Centauri exhibits large star-to-star variations in iron with [Fe/H] ranging from ~-2.0 to ~-0.7dex. Barium and lanthanum abundances of metal-poor stars are correlated with iron, up to [Fe/H]~-1.5, while they are almost constant (or at least have only a moderate increase) in the more metal-rich populations. There is an extended Na-O anticorrelation for stars with [Fe/H]<~-1.3 while more metal-rich stars are almost all Na-rich. Sodium was found to mildly increase with iron over the entire metallicity range.2011ApJ...731...64Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/731/64CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/416/L6 : AGB and RGB stars in {omega} Cen (McDonald+, 2011)J/ApJ/722/1373 : {omega} Centauri giants abundances (Johnson+, 2010)J/ApJ/698/2048 : Abundances of red giants in {omega} Cen (Johnson+, 2009)J/MNRAS/396/2183 : RVs of red giants in {omega} Cen (Sollima+ 2009)J/ApJ/681/1505 : Abundances of red giants in {omega} Cen (Johnson+, 2008)J/ApJ/661/L155 : Radial velocities RGB stars in omega Cen (Pancino+, 2007)J/ApJ/647/1075 : Age-metallicity relation of {omega} Cen (Stanford+, 2006)J/MNRAS/357/265 : BVI photometry of omega Cen red giants (Sollima+, 2005)J/A+A/360/472 : Proper motions in omega Centauri (van Leeuwen+, 2000)J/ApJ/462/241 : Ca abundance for Omega Cen red giants (Norris+ 1996)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/731/64https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/731/64http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/731/64https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/731/64https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/731/64http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/731/64GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/731/64/table1 (Coordinates RA and DEC, V magnitude, adopted atmospheric parameters and measured abundance ratios for the 300 stars in {omega} Cen)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/731/64/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/731/64/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/731/64/table1?GETtext/xml+votable180.050000true201.81838611-47.549133060.0055555555555555566/43225 43227https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/731/64?format=asciiOpticaldefaultJ/ApJ/731/64/table1Coordinates RA and DEC, V magnitude, adopted atmospheric parameters and measured abundance ratios for the 300 stars in {omega} CenrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification from the photometric catalog of Bellini et al. (2009A&A...507.1393B) (<NNNNNN> or RGB.NNN formats)meta.id;meta.maincharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainVmagV band magnitudemagphot.mag;em.opt.VfloatTeffEffective temperatureKphys.temperature.effectiveintlog(g)Log of the surface gravitylog(cm.s**-2)phys.gravityfloatVtMicroturbulent velocitykm/sphys.velocfloat[Fe/H]Log of the Fe/H number abundancelog(Sun)meta.idfloat[O/Fe]? Log of the O/Fe number abundancelog(Sun)meta.idfloatnullable[Na/Fe]? Log of the Na/Fe number abundancelog(Sun)meta.idfloatnullable[Ba/Fe]Log of the Ba/Fe number abundancelog(Sun)meta.idfloat[La/Fe]? Log of the La/Fe number abundancelog(Sun)phys.abundfloatnullableL00Cross-match with van Leeuwen+, 2000, Cat. J/A+A/360/472 within 1"meta.ref.urlintnullableOCatCross-match with other omega Cen catalogs within 1"meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.refchar