J/A+A/464/927ivo://CDS.VizieR/J/A+A/464/927doi:10.26093/cds/vizier.34640927CDSCarretta E.Bragaglia A.Gratton R.G.Lucatello S.Momany Y.2017-06-19T07:57:41Z2009-09-17T16:32:59ZCDS support team

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

cds-question@unistra.frglobular-star-clusterspopulation-ii-starschemical-abundancesradial-velocityWe are studying the Na-O anticorrelation in several globular clusters of different Horizontal Branch (HB) morphology in order to derive a possible relation between (primordial) chemical inhomogeneities and morphological parameters of the cluster population. We used the multifiber spectrograph FLAMES on the ESO Very Large Telescope UT2 and derived atmospheric parameters and elemental abundances of Fe, O and Na for about 150 red giant stars in the Galactic globular cluster NGC 6752. The average metallicity we derive is [Fe/H]=-1.56, in agreement with other results from red giants, but lower than obtained for dwarfs or early subgiants. In NGC 6752 there is not much space for an intrinsic spread in metallicity: on average, the rms scatter in [Fe/H] is 0.037+/-0.003dex, while the scatter expected on the basis of the major error sources is 0.039+/-0.003dex. The distribution of stars along the Na-O anticorrelation is different to what was found in the first paper of this series for the globular cluster NGC 2808: in NGC 6752 it is skewed toward more Na-poor stars, and it resembles more the one in M 13. Detailed modeling is required to clarify whether this difference may explain the very different distributions of stars along the HB.2007A&A...464..927Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/464/927CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/455/271 : Abundances of red giants in NGC 6441 (Gratton+, 2006)J/A+A/464/939 : Abundances of red giants in NGC 6218 (Carreta+, 2007)J/A+A/464/953 : Abundances of red giants in NGC 6441 (Gratton+, 2007)J/A+A/464/967 : Abundances of red giants in NGC 6388 (Carreta+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/464/927https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/464/927http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/464/927https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/464/927https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/464/927http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/464/927GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/464/927/table2 (Identification, equatorial coordinates, VBJK magnitudes, S/N, heliocentric radial velocity)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/464/927/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/464/927/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/464/927/table2?GETtext/xml+votable180.050000true288.00308333-60.003291670.0055555555555555566/47125 471681.5062136169708525e-19 4.920466254354166e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/464/927?format=asciiOpticaldefaultJ/A+A/464/927/table2Identification, equatorial coordinates, VBJK magnitudes, S/N, heliocentric radial velocityrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification (from Momany et al., 2004A&A...420..605M)meta.id;meta.mainintprimaryRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainVmag? Johnson V magnitudemagphot.mag;em.opt.VfloatnullableBmag? Johnson B magnitudemagphot.mag;em.opt.BfloatnullableJmag? 2MASS J magnitudemagphot.mag;em.IR.JfloatnullableKmag? 2MASS J magnitudemagphot.mag;em.IR.KfloatnullableS/NSignal-to-Noise ratiostat.snrintASimbad column added by the CDSmeta.ref.urlcharHRV11? Heliocentric radial velocity for grating HR11km/sspect.dopplerVeloc;pos.heliocentricfloatnullableHRV13? Heliocentric radial velocity for grating HR13km/sspect.dopplerVeloc;pos.heliocentricfloatnullableFlag[F*+, ] Notes (1)meta.code.errorcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/464/927/tableaEquivalent widths for 137 objectsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification (from Momany et al., 2004A&A...420..605M)meta.id;meta.mainintlambdaWavelength0.1nmem.wlfloatEPExcitation potentialeVphys.atmol.excitationfloatloggfSurface gravitylog(cm.s**-2)phys.gravityfloatEWEquivalent width0.1pmspect.line.eqWidthfloatJ/A+A/464/927/abundAtmospheric parameters, iron, O and Na abundancesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification (from Momany et al., 2004A&A...420..605M)meta.id;meta.mainintTeffEffective temperatureKphys.temperature.effectiveintloggGravitylog(cm.s**-2)phys.gravityfloat[A/H]Metallicitylog(Sun)phys.abundfloatVtMicroturbulent velocitykm/sphys.velocfloato_FeINumber of lines of Fe Imeta.numberint[Fe/H]IAverage star [Fe/H]Ilog(Sun)meta.idfloate_[Fe/H]Irms uncertainty on [Fe/H]Ilog(Sun)stat.error;phys.abund.Fefloato_FeII? Number of lines of Fe IImeta.numberintnullable[Fe/H]II? Average star [Fe/H]IIlog(Sun)meta.idfloatnullablee_[Fe/H]II? rms uncertainty on [Fe/H]IIlog(Sun)stat.error;phys.abund.Fefloatnullableo_O? Number of lines of Ometa.numberintnullable[O/Fe]? Average [O/Fe]log(Sun)phys.abundfloatnullablee_[O/Fe]? rms uncertainty on [O/Fe]log(Sun)stat.error;phys.abundfloatnullableo_Na? Number of lines of Nameta.numberintnullable[Na/Fe]? Average [Na/Fe]log(Sun)phys.abundfloatnullablee_[Na/Fe]? rms uncertainty on [Na/Fe]log(Sun)stat.error;phys.abundfloatnullableFlag1[1/3] Flag for grating (1)meta.code.errorintFlag2[0/1] Flag for measure/limit for O (2)meta.code.errorintEWallAll Equivalent Width for this starmeta.ref.urlchar