J/A+A/455/271ivo://CDS.VizieR/J/A+A/455/271doi:10.26093/cds/vizier.34550271CDSGratton R.G.Lucatello S.Bragaglia A.Carretta E.Momany Y.,Pancino E.Valenti E.2017-09-22T16:16:07Z2006-11-05T22:03:44ZCDS support team

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

cds-question@unistra.frglobular-star-clustersgiant-starsline-intensitieschemically-peculiar-starsThe aim of the present work is to determine accurate metallicities for a group of red giant branch stars in the field of the bulge Globular Cluster NGC 6441. This is the third paper in a series resulting from a large project aimed at determining the extent of the Na-O anticorrelation among Globular Cluster stars and exploring its relationship with HB morphology. We present an LTE abundance analysis of these objects, based on data gathered with the FLAMES fiber facility and the UVES spectrograph at VLT2. Results. Five of the thirteen stars observed are members of the cluster. The average Fe abundance for these five stars is [Fe/H]=-0.39+/-0.04+/-0.05dex, where the first error bar includes the uncertainties related to star-to-star random errors, and the second one the systematic effects related to the various assumptions made in the analysis.The overall abundance pattern is quite typical of Globular Clusters, with an excess of the alpha-elements and of Eu. There is evidence that the stars of NGC 6441 are enriched in Na and Al, while they have been depleted of O and Mg by H-burning at high temperatures, analogous with extensive observations of other Globular Clusters: in particular, one star is clearly Na and Al-rich and O and Mg-poor. We also obtained quite high V abundances, but it is possible that this is an artifact of the analysis, since similar high V abundances are also derived for the field stars. These last are all more metal-rich than NGC 6441 and probably belong to the bulge population bulge.2006A&A...455..271Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/455/271CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/117/1313 : NGC 6441 VI photometry (Layden+, 1999)J/A+A/440/901 : Reddening and metallicity of NGC 6752 (Gratton, 2005)J/A+AS/113/299 : Abundances and velocities for cluster giants (Minniti 1995)J/AJ/127/373 : Elemental abund. of 3 red giants in Ter 7 (Tautvaisiene+ 2004)J/AJ/129/1607 : Equivalent widths of 4 RGB in NGC 7492 (Cohen+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/455/271https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/455/271http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/455/271https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/455/271https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/455/271http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/455/271GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/455/271/table2 (Photometry and spectroscopic data for stars observed with UVES)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/455/271/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/455/271/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/455/271/table2?GETtext/xml+votable180.050000true267.422-36.95330.0055555555555555566/28705https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/455/271?format=asciiOpticaldefaultJ/A+A/455/271/table34Equivalent Widths for cluster members and field starsElElementphys.atmol.elementcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMembSimbad column added by the CDSsrc.classcharSeqSequential numbermeta.recordintLambdaWavelength0.1nmem.wlfloatEpExcitation potentialeVphys.atmol.excitationfloatlog(gf)log Oscillator strengthphys.atmol.oscStrengthfloatEW? Equivalent width0.1pmspect.line.eqWidthfloatnullablelogAbund? log Abundancephys.abundfloatnullableJ/A+A/455/271/table2Photometry and spectroscopic data for stars observed with UVESrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.recordintprimaryFib[1/2] Fiber configurationmeta.noteintRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainDistDistance from the cluster centerarcsecpos.angDistanceintVmagJohnson V magnitudemagphot.mag;em.opt.VfloatV-IcJohnson-Cousins V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatV-K? Johnson V-K colour indexmagphot.color;em.opt.V;em.IR.KfloatnullableRVRadial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatS/NSignal-to-noise ratiostat.snrinte_EW? rms uncertainty on EW0.1pmstat.error;spect.line.eqWidthfloatnullable[Fe/H]? Metallicitylog(Sun)phys.abund.ZfloatnullableNoteNotesmeta.notechar