J/MNRAS/475/257ivo://CDS.VizieR/J/MNRAS/475/257doi:10.26093/cds/vizier.74750257CDSMacLean B.T.Campbell S.W.De Silva G.M.Lattanzio J.D'Orazi V.,Cottrell P.L.Momany Y.Casagrande L.2024-08-18T20:18:02Z2021-04-26T14:26:20ZCDS support team

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

cds-question@unistra.frglobular-star-clustersgiant-starsinfrared-photometryvisible-astronomybroad-band-photometrychemical-abundancesIt has been well established that Galactic Globular clusters (GCs) harbour more than one stellar population, distinguishable by the anticorrelations of light-element abundances (C-N, Na-O, and Mg-Al). These studies have been extended recently to the asymptotic giant branch (AGB). Here, we investigate the AGB of NGC 6397 for the first time. We have performed an abundance analysis of high-resolution spectra of 47 red giant branch (RGB) and eight AGB stars, deriving Fe, Na, O, Mg, and Al abundances. We find that NGC 6397 shows no evidence of a deficit in Na-rich AGB stars, as reported for some other GCs - the subpopulation ratios of the AGB and RGB in NGC 6397 are identical, within uncertainties. This agrees with expectations from stellar theory. This GC acts as a control for our earlier work on the AGB of M4 (with contrasting results), since the same tools and methods were used.2018MNRAS.475..257Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/475/257CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/527/A148 : NGC6397 red giants chemical composition (Lind+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/475/257https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/475/257http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/475/257https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/475/257https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/475/257http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/475/257GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/475/257/table1 (NGC 6397 target details)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/475/257/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/475/257/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/475/257/table1?GETtext/xml+votable180.050000true265.0277083-53.58336110.0055555555555555566/420761.1166583743361574e-19 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/475/257?format=asciiOpticalInfrareddefaultJ/MNRAS/475/257/table1NGC 6397 target detailsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar identification number from Momany et al. (2003A&A...407..303M)meta.id;meta.mainintType[AGB RGB] Typesrc.classchar2MASS2MASS ID (HHMMSSss+DDMMSSs)meta.idcharL11? Lind et al. (2011, Cat. J/A+A/527/A148) ID, [LPC2009] NNNNNNN in Simbadmeta.idintnullableVmagV magnitude from Momany et al. (2003A&A...407..303M)magphot.mag;em.opt.VfloatBmagB magnitude from Momany et al. (2003A&A...407..303M)magphot.mag;em.opt.BfloatUmag? U magnitude from Momany et al. (2003A&A...407..303M)magphot.mag;em.opt.UfloatnullableImag? I magnitude from Momany et al. (2003A&A...407..303M)magphot.mag;em.opt.IfloatnullableJmag? 2MASS J magnitude (Cat. VII/233)magphot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitude (Cat. VII/233)magphot.mag;em.IR.HfloatnullableKmag? 2MASS K magnitude (Cat. VII/233)magphot.mag;em.IR.KfloatnullableRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from 2MASS name (right ascension part)degpos.eq.ra;meta.main_DEPositions from 2MASS name (declination part)degpos.eq.dec;meta.mainJ/MNRAS/475/257/table5Stellar parameters and derived chemical abundances for each star in NGC 6397recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar identification number from Momany et al. (2003A&A...407..303M)meta.id;meta.mainintType[AGB RGB] Typesrc.classcharTeffEffective temperatureJphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloatvtMicro-turbulent velocitykm/sphys.velocfloat[FeI/H]Abundance [FeI/H]phys.abundfloate_[FeI/H]rms uncertainty on [FeI/H] (1)stat.error;phys.abundfloat[FeII/H]Abundance [FeII/H]phys.abundfloate_[FeII/H]rms uncertainty on [FeII/H] (1)stat.error;phys.abundfloat[O/H]Abundance [O/H]phys.abundfloate_[O/H]rms uncertainty on [O/H] (1)stat.error;phys.abundfloat[Na/H]Abundance [Na/H]phys.abundfloate_[Na/H]rms uncertainty on [Na/H] (1)stat.error;phys.abundfloat[Mg/H]Abundance [Mg/H]phys.abundfloate_[Mg/H]rms uncertainty on [Mg/H] (1)stat.error;phys.abundfloat[Al/H]Abundance [Al/H]phys.abundfloate_[Al/H]rms uncertainty on [Al/H] (1)stat.error;phys.abundfloat