J/ApJ/769/40ivo://CDS.VizieR/J/ApJ/769/40doi:10.26093/cds/vizier.17690040CDSCarretta E.Gratton R.G.Bragaglia A.D'Orazi V.Lucatello S.,Sollima A.Sneden C.2017-10-03T05:12:35Z2014-12-12T13:12:11ZCDS support team

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

cds-question@unistra.frchemical-abundancesglobular-star-clustersgiant-starsline-intensitiesTwo independent studies recently uncovered two distinct populations among giants in the distant, massive globular cluster (GC) NGC 2419. One of these populations has normal magnesium (Mg) and potassium (K) abundances for halo stars: enhanced Mg and roughly solar K. The other population has extremely depleted Mg and very enhanced K. To better anchor the peculiar NGC 2419 chemical composition, we have investigated the behavior of K in a few red giant branch stars in NGC 6752, NGC 6121, NGC 1904, and {omega} Cen. To verify that the high K abundances are intrinsic and not due to some atmospheric features in giants, we also derived K abundances in less evolved turn-off and subgiant stars of clusters 47 Tuc, NGC 6752, NGC 6397, and NGC 7099. We normalized the K abundance as a function of the cluster metallicity using 21 field stars analyzed in a homogeneous manner. For all GCs of our sample, the stars lie in the K-Mg abundance plane on the same locus occupied by the Mg-normal population in NGC 2419 and by field stars. This holds for both giants and less-evolved stars. At present, NGC 2419 seems unique among GCs.2013ApJ...769...40Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/769/40CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/202 : Globular Clusters in the Milky Way (Harris, 1997)J/A+A/572/A108 : 47 Tuc red giants chemical composition (Thygesen+, 2014)J/A+A/550/A34 : Abundances of red giants in M4 and 47 Tuc (Carretta+, 2013)J/ApJ/760/86 : Equivalent widths for 13 NGC2419 RGB stars (Cohen+, 2012)J/ApJ/750/L14 : Abundances of red giants in NGC 6752 (Carretta+, 2012)J/ApJ/742/37 : Abundances of six RGB stars in M22 (Roederer+, 2011)J/ApJ/740/60 : EWs for NGC2419 and NGC7099 RGB stars (Cohen+, 2011)J/AJ/141/81 : NGC 2419 variable star population (Di Criscienzo+, 2011)J/A+A/527/A148 : NGC6397 red giants chemical composition (Lind+, 2011)J/ApJ/712/L21 : Calcium abundances in 17 globular clusters (Carretta+, 2010)J/A+A/520/A95 : Abundances of red giants in M54 and Sgr dSph (Carretta+, 2010)J/A+A/505/139 : Abundances of red giants in 17 GCs (Carretta+, 2009)J/ApJ/698/2048 : Abundances of red giants in {omega} Cen (Johnson+, 2009)J/A+A/490/625 : Abundances of NGC 6121 red giants (Marino+, 2008)J/A+A/464/927 : Abundances of red giants in NGC 6752 (Carretta+, 2007)J/A+A/404/187 : Equivalent widths for metal-poor stars (Gratton+, 2003)J/A+A/354/169 : Metal-poor field stars abundances (Gratton+, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/769/40https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/769/40http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/769/40https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/769/40https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/769/40http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/769/40GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/769/40/table1 (Relevant data for stars in the 7 program clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/769/40/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/769/40/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/769/40/table1?GETtext/xml+votable180.050000true5.306875-72.05900280.0055555555555555566/21017 33321 33323 42076 42955 43225 43227 47125 47168 48434https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/769/40?format=asciiOpticaldefaultJ/ApJ/769/40/table1Relevant data for stars in the 7 program clustersSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar designationmeta.id;meta.maincharNGCCluster name (GC)meta.id.parentintEvolEvolutionary status: TO=turnoff, SGB=subgiant, RGB=red giant branch.src.classcharS/N[21/184] Signal-to-noise ratiostat.snrintTeff[3900/6476] TemperatureKphys.temperatureintlogg[0.7/4.3] log of the surface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H][-2.4/-0.4] Iron abundancelog(Sun)phys.abund.Fefloatvt[0/2] Microtubulent velocity {xi}km/sphys.velocfloatEW[6/296] K line (7698) equivalent width (m{AA})1e-13mspect.line.eqWidthfloat[K/Fe]Potassium abundance (NLTE)log(Sun)phys.abundfloat[Mg/Fe]? Magnesium abundancelog(Sun)phys.abundfloatnullable[Al/Fe]? Aluminum abundancelog(Sun)phys.abundfloatnullablerefPARef for atmospheric parameters (2)meta.bibcharrefAReference(s) for abundances (3)meta.bibcharRAJ2000Hour of right ascension (J2000) (4)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000) (4)pos.eq.dec;meta.mainGCCatCross-match within 1" to red giants stars in GC catalogs (Carretta et al. 2009, J/A+A/505/117; Carretta et al. 2009, J/A+A/505/139 and Carretta et al. 2010, J/ApJ/712/L21)meta.ref.urlintnullable