J/ApJ/716/L166ivo://CDS.VizieR/J/ApJ/716/L166doi:10.26093/cds/vizier.17169166CDSD'Orazi V.Marino A.F.2017-11-29T11:48:38Z2012-06-21T13:07:21ZCDS support team

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

cds-question@unistra.frglobular-star-clusterschemical-abundancesgiant-starsThe determination of Li and proton-capture element abundances in globular cluster (GC) giants allows us to constrain several key questions on the multiple population scenarios in GCs, from formation and early evolution to pollution and dilution mechanisms. In this Letter, we present our results on Li abundances for a large sample of giants in the intermediate-metallicity GC NGC 6121 (M4), for which Na and O have been already determined by Marino et al. (2008, Cat. J/A+A/490/625). The stars analyzed are both below and above the red giant branch bump luminosity. We found that the first and second generation stars share the same Li content, suggesting that a Li production must have occurred. This provides strong observational evidence supporting the scenario in which asymptotic giant branch stars are GC polluters.2010ApJ...716L.166Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/716/L166CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/539/A157 : Lithium and sodium in M4 (Monaco+, 2012)J/MNRAS/412/81 : Lithium abundance in M4 red giants (Mucciarelli+, 2011)J/A+A/490/625 : Abundances of NGC 6121 red giants (Marino+, 2008)J/ApJ/689/1031 : Heavy element abundances in giant stars (Yong+, 2008)J/AJ/127/2771 : HST proper-motions of M4 main-sequence stars (Richer+, 2004)J/AJ/124/1486 : M4 UBV color-magnitude diagrams (Mochejska+, 2002)J/ApJS/120/265 : HST photometry of M4 (Ibata+, 1999)J/AJ/114/189 : M 4 CCD photometry (Alcaino+, 1997)J/PAZh/22/847 : Identification and coordinates in M4 (Shokin+, 1996)J/ApJ/443/124 : Radial Velocities of Stars in M4 (Peterson+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/716/L166https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/716/L166http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/716/L166https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/716/L166https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/716/L166http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/716/L166GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/716/L166/table1 (Stellar parameters and abundances for our sample stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/716/L166/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/716/L166/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/716/L166/table1?GETtext/xml+votable180.050000true245.94994389-26.545241110.0055555555555555566/42955https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/716/L166?format=asciiOpticaldefaultJ/ApJ/716/L166/table1Stellar parameters and abundances for our sample starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStar[5359/45895] Stellar identification number (<Cl* NGC 6121 MVP NNNNN> in Simbad)meta.id;meta.mainintTeff[3860/4950] Effective temperatureKphys.temperature.effectiveintlog(g)[0.5/3.05] Log of the surface gravitylog(cm.s**-2)phys.gravityfloatxi[1.1/1.88] Turbulent velocitykm/sphys.velocfloat[Na/Fe][-0.05/0.53] Log Na/Fe number abundance ratiometa.idfloate_[Na/Fe]Error in [Na/Fe]stat.error;phys.abundfloatlogn(Li)[0/1.62] Log of Li number abundancephys.abundfloate_logn(Li)Error in logn(Li)stat.errorfloatSimbadSimbad column added by the CDSmeta.refchar_RAPositions from Marino et al. 2008, Cat. J/A+A/490/625 (right ascension part)degpos.eq.ra;meta.main_DEPositions from Marino et al. 2008, Cat. J/A+A/490/625 (declination part)degpos.eq.dec;meta.main