J/A+A/600/A104ivo://CDS.VizieR/J/A+A/600/A104doi:10.26093/cds/vizier.36000104CDSMucciarelli A.Merle T.Bellazzini M.2018-01-02T13:43:18Z2017-04-06T08:24:03ZCDS support team

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

cds-question@unistra.frglobular-star-clusterspopulation-ii-starschemical-abundancesWe derived Potassium abundances in red giant branch stars in the Galactic globular clusters NGC 104 (144 stars), NGC 6752 (134 stars) and NGC 6809 (151 stars) using high-resolution spectra collected with FLAMES at the ESO - Very Large Telescope. In the considered samples we do not find significant intrinsic spreads in [K/Fe] (confirming the previous findings by Carretta et al.), at variance with the cases of the massive clusters NGC 2419 and NGC 2808. Additionally, marginally significant [K/Fe]-[O/Fe] anti-correlations are found in NGC 104 and NGC 6809, and [K/Fe]-[Na/Fe] correlations are found in NGC 104 and NGC 6752. No evidence of [K/Fe]-[Mg/Fe] anti-correlation are found. The results of our analysis are consistent with a scenario in which the process leading to the multi-populations in globular clusters implies also enrichment in the K abundance, the amplitude of the associated [K/Fe] enhancement becoming measurable only in stars showing the most extreme effects of O and Mg depletion. Stars enhanced in [K/Fe] have been found so far only in clusters harbouring some Mg-poor stars, while the other globulars, without a Mg-poor sub-population, show small or null [K/Fe] spreads.2017A&A...600A.104Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/600/A104CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/464/927 : NGC 6752 red giants abundances (Carretta+, 2007)J/A+A/505/117 : 15 globular clusters red giants abundances (Carretta+, 2009)J/A+A/505/139 : 17 globular clusters red giants abundances (Carretta+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/600/A104https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/600/A104http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/600/A104https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/600/A104https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/600/A104http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/600/A104GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/600/A104/table1 (Atmospheric parameters and [K/Fe] abundance ratios)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/600/A104/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/600/A104/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/600/A104/table1?GETtext/xml+votable180.050000true6.0309125-71.94906670.0055555555555555566/33321 47125 47168 47970-47971https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/600/A104?format=asciidefaultJ/A+A/600/A104/table1Atmospheric parameters and [K/Fe] abundance ratiosSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster namemeta.id.parentcharIDStar ID (1)meta.idintTeffEffective temperatureKphys.temperature.effectiveintlog(g)Surface gravitylog(cm.s**-2)phys.gravityfloatvtMicroturbulent velocitykm/sphys.velocfloatEWEquivalent width of the K line at 7699 {AA}mAspect.line.eqWidthfloat[K/Fe]Relative abundance [K/Fe]log(Sun)phys.abundfloate_[K/Fe]Uncertainty on [K/Fe]log(Sun)stat.error;phys.abundfloatCarDisplay Carreta et al. datameta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main