J/ApJ/760/86ivo://CDS.VizieR/J/ApJ/760/86doi:10.26093/cds/vizier.17600086CDSCohen J.G.Kirby E.N.2018-01-08T06:37:43Z2014-08-21T08:44:06ZCDS support team

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

cds-question@unistra.frline-intensitiesradial-velocitygiant-starsglobular-star-clustersWe present new Keck/HIRES observations of six red giants in the globular cluster (GC) NGC 2419. Although the cluster is among the most distant and most luminous in the Milky Way, it was considered chemically ordinary until very recently. Our previous work showed that the near-infrared Ca II triplet line strength varied more than expected for a chemically homogeneous cluster, and that at least one star had unusual abundances of Mg and K. Here, we confirm that NGC 2419 harbors a population of stars, comprising about one-third of its mass, that is depleted in Mg by a factor of eight and enhanced in K by a factor of six with respect to the Mg-normal population. Although the majority, Mg-normal population appears to have a chemical abundance pattern indistinguishable from ordinary, inner-halo GCs, the Mg-poor population exhibits dispersions of several elements. The abundances of K and Sc are strongly anti-correlated with Mg, and some other elements (Si and Ca among others) are weakly anti-correlated with Mg. These abundance patterns suggest that the different populations of NGC 2419 sample the ejecta of diverse supernovae in addition to asymptotic giant branch ejecta. However, the abundances of Fe-peak elements except Sc show no star-to-star variation. We find no nucleosynthetic source that satisfactorily explains all of the abundance variations in this cluster. Because NGC 2419 appears like no other GC, we reiterate our previous suggestion that it is not a GC at all, but rather the core of an accreted dwarf galaxy.2012ApJ...760...86Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/760/86CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/431/1995 : Deep uVI photometry of NGC2419 (Beccari+, 2013)J/AJ/141/81 : NGC 2419 variable star population (Di Criscienzo+, 2011)J/ApJ/740/60 : EWs for NGC2419 and NGC7099 RGB stars (Cohen+, 2011)J/ApJ/738/186 : HST and DEIMOS measurements of NGC 2419 stars (Ibata+, 2011)J/ApJ/682/1217 : Abundances in red giants in 7 globular clusters (Kirby+, 2008)J/ApJ/681/311 : Blue stragglers in NGC 2419 (Dalessandro+, 2008)J/AJ/136/2259 : HST photometry of stars in NGC 2419 (Sandquist+, 2008)J/PASP/117/37 : BVRI photometry in NGC 2419, Pal 4, and Pal 14 (Saha+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/760/86https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/760/86http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/760/86https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/760/86https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/760/86http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/760/86GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/760/86/table1 (Data for red giant members of NGC 2419 with Keck/HIRES spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/760/86/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/760/86/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/760/86/table1?GETtext/xml+votable180.050000true114.485208338.85633330.0055555555555555566/6389https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/760/86?format=asciiOpticaldefaultJ/ApJ/760/86/table1Data for red giant members of NGC 2419 with Keck/HIRES spectraSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSetN=new stars or C11=Cohen et al., 2001, Cat. J/ApJ/740/60meta.idcharIDStar name (SNNNN) (1)meta.id;meta.maincharn_IDNote on star (2)meta.notecharMgSimbad column added by the CDSsrc.classcharVmag[17.2/18] V-band magnitude (1)magphot.mag;em.opt.VfloatTeff[4265/4482] Effective temperature (3)Kphys.temperature.effectiveintlogg[0.6/1.1] Surface gravity (3)log(cm.s**-2)phys.gravityfloatExp[3000/14400] Exposure timestime.duration;obs.exposureintl_S/NLimit flag on S/Nmeta.code.errorcharS/NSignal to noise ratio (4)stat.snrintRV[-26.1/-16.8] Radial velocitykm/sphys.veloc;pos.heliocentricfloatC11Link to data from Cohen+, 2011, Cat. J/ApJ/740/60, if anymeta.numberintnullableEWDislay the Equivalent Widths for this star (table 2 or 3)meta.ref.urlchar2MDisplay the 2MASS data within 2" (Cutri et al. 2003, Cat. II/246)meta.ref.urlchar_RAPositions from Stetson,http://www3.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/community/STETSON/standards/NGC2419.pos (right ascension part)degpos.eq.ra;meta.main_DEPositions from Stetson,http://www3.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/community/STETSON/standards/NGC2419.pos (declination part)degpos.eq.dec;meta.mainJ/ApJ/760/86/table2Equivalent widths for five Mg-poor stars and S406 in NGC 2419 with Keck/HIRES spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLine[4033/7797.6] Line wavelength; in Angstroms0.1nmem.wl;spect.linefloatIonSpecies identifierphys.atmol.ionStagecharchi[0/6] Excitation potential {chi}eVphys.atmol.excitationfloatlog(gf)[-6/0.7] Log of the oscillator strengthphys.atmol.oscStrengthfloatS458[10/266]? Equivalent width in S458 (m{AA})1e-13mspect.line.eqWidthfloatnullableS1004? Equivalent width in S1004 (m{AA})1e-13mspect.line.eqWidthfloatnullablel_S1065[<=] Limit flag on S1065meta.code.errorcharS1065? Equivalent width in S1065 (m{AA})1e-13mspect.line.eqWidthfloatnullableS1131[-11/266]? Equivalent width in S1131 (m{AA})1e-13mspect.line.eqWidthfloatnullableS1673? Equivalent width in S1673 (m{AA})1e-13mspect.line.eqWidthfloatnullableS406[8/390]? Equivalent width in S406 (m{AA})1e-13mspect.line.eqWidthfloatnullableJ/ApJ/760/86/table3Equivalent widths for seven Mg-normal RGB stars in NGC 2419 with Keck/HIRES spectra (corrected version of the table sent by the author)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLine[3961.5/7797.6] Line wavelength; in Angstroms0.1nmem.wl;spect.linefloatIonSpecies identifierphys.atmol.ionStagecharchi[0/6] Excitation potential {chi}eVphys.atmol.excitationfloatlog(gf)[-10.3/0.7] Log of the oscillator strengthphys.atmol.oscStrengthfloatS810[5/395]? Equivalent width in S810 (m{AA})1e-13mspect.line.eqWidthfloatnullablel_S973[<=] Limit flag on S973meta.code.errorcharS973? Equivalent width in S973 (m{AA})1e-13mspect.line.eqWidthfloatnullableS1166? Equivalent width in S1166 (m{AA})1e-13mspect.line.eqWidthfloatnullableS1209? Equivalent width in S1209 (m{AA})1e-13mspect.line.eqWidthfloatnullablel_S1305[<=] Limit flag on S1305meta.code.errorcharS1305? Equivalent width in S1305 (m{AA})1e-13mspect.line.eqWidthfloatnullableS1814[8/420]? Equivalent width in S1814 (m{AA})1e-13mspect.line.eqWidthfloatnullableS223[6.7/406.8]? Equivalent width in S223 (m{AA})1e-13mspect.line.eqWidthfloatnullable