J/A+A/592/A66ivo://CDS.VizieR/J/A+A/592/A66doi:10.26093/cds/vizier.35920066CDSWang Y.Primas F.Charbonnel C.Van der Swaelmen M.Bono G.,Chantereau W.Zhao G.2018-06-08T09:56:30Z2016-07-26T08:07:12ZCDS support team

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

cds-question@unistra.frglobular-star-clustersgiant-starschemical-abundancesphotometryradial-velocityGalactic globular clusters (GC) are known to have multiple stellar populations and be characterised by similar chemical features, e.g., O-Na anti-correlation. While second-population stars, identified by their Na overabundance, have been found from the main sequence turnoff up to the tip of the red giant branch in various Galactic GCs, asymptotic giant branch stars have rarely been targeted. Here we present the results of our high-resolution spectroscopic study of a sample of AGB and RGB stars in the Galactic globular cluster NGC 2808. We derived accurate Na abundances for 31 AGB and 40 RGB stars in this cluster. Comparable Na abundance dispersions are found for our AGB and RGB samples, and we conclude that NGC 2808 has Na-rich second-population AGB stars, which turn out to be even more numerous - in relative terms - than their Na-poor counterparts (on the AGB) and the Na-rich stars on the RGB.2016A&A...592A..66Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/592/A66CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/84/59 : Photometry of NGC 2808 (Ferraro+, 1990)J/ApJ/562/368 : UV photometry in NGC 2808 (Brown+, 2001)J/A+A/413/343 : RGB stars in NGC 2808 (Cacciari+, 2004)J/ApJ/625/156 : FUV-NUV observations of NGC 2808 (Dieball+, 2005)J/AJ/131/1766 : Abundances & equivalent widths in NGC 2808 (Carretta, 2006)J/A+A/490/641 : X-ray sources toward NGC 2808 (Servillat+, 2008)J/A+A/534/A123 : Horizontal branch stars in NGC 2808 (Gratton+, 2011)J/A+A/542/A129 : NGC 2808 central kinematics (Luetzgendorf+, 2012)J/MNRAS/437/1609 : NGC 2808 HB stars abundances (Marino+, 2014)J/ApJ/810/148 : Red giant abundances in NGC 2808 (Carretta, 2015)J/A+A/586/A51 : JK photometry of NGC 2808 (Massari+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/592/A66https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/592/A66http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/592/A66https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/592/A66https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/592/A66http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/592/A66GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/592/A66/sample (Basic informations (table 2), stellar parameters (table4) and Na abundances (table6) of our stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/592/A66/sample?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/592/A66/sample?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/592/A66/sample?GETtext/xml+votable180.050000true137.8782083-64.89386110.0055555555555555566/37294 376361.1166583743361574e-19 5.042107639525881e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/592/A66?format=asciidefaultJ/A+A/592/A66/sampleBasic informations (table 2), stellar parameters (table4) and Na abundances (table6) of our starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarIDStar identification (1)meta.id;meta.maincharEvolPh[AGB RGB] Evolutionary phasesrc.classcharInstInstrument used to obtain the spectruminstr.setupcharRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainBmagApparent Johnson-Morgan B magnitude (2)magphot.mag;em.opt.Bfloate_BmagError of B magnitude (2)magstat.error;phot.mag;em.opt.BfloatVmagApparent Johnson-Morgan V magnitude (2)magphot.mag;em.opt.Vfloate_VmagError of V magnitude (2)magstat.error;phot.mag;em.opt.VfloatImagApparent Johnson-Morgan I magnitude (2)magphot.mag;em.opt.Ifloate_ImagError of I magnitude (2)magstat.error;phot.mag;em.opt.IfloatJmag? 2MASS J magnitude (3)magphot.mag;em.IR.Jfloatnullablee_Jmag? Error of J magnitude (3)magstat.error;phot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitude (3)magphot.mag;em.IR.Hfloatnullablee_Hmag? Error of H magnitude (3)magstat.error;phot.mag;em.IR.HfloatnullableKmag? 2MASS K magnitude (3)magphot.mag;em.IR.Kfloatnullablee_Kmag? Error of K magnitude (3)magstat.error;phot.mag;em.IR.KfloatnullableRVBarycentric radial velocitykm/sphys.veloc;pos.heliocentricfloat2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloatVturbMicroturbulence velocitykm/sphys.veloc.microTurbfloat[FeI/H]LTELTE line ratio [FeI/H]phys.abund.Fefloats_FeIlineAbundance dispersion of FeI linesinstr.dispersionfloat[FeII/H]Line ratio [FeII/H]phys.abund.Fefloats_FeIIlineAbundance dispersion of FeII linesinstr.dispersionfloat[FeI/H]NLTENLTE line ratio [FeI/H]phys.abund.Fefloat[Na/H]6154LTE? LTE [Na/H] from 6154A Na line (1)phys.abundfloatnullable[Na/H]6154NLTE? NLTE [Na/H] from 6154A Na line (1)phys.abundfloatnullable[Na/H]6160LTE? LTE [Na/H] from 6160A Na line (1)phys.abundfloatnullable[Na/H]6160NLTE? NLTE [Na/H] from 6160A Na line (1)phys.abundfloatnullable[Na/H]LTE? Average LTE [Na/H] (1)phys.abundfloatnullable[Na/H]NLTE? Average NLTE [Na/H] (1)phys.abundfloatnullable[Na/FeI]NLTE? Average NLTE [Na/FeI] (1)phys.abundfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar