J/A+AS/121/95ivo://CDS.VizieR/J/A+AS/121/95CDSCarretta E.Gratton R.G.2014-02-10T14:44:46Z1999-02-27T12:25:04ZCDS support team

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

cds-question@unistra.freffective-temperaturemetallicityWe have obtained high resolution, high signal-to-noise ratio CCD echelle spectra of 10 bright red giants in 3 globular clusters (47 Tuc, NGC 6752 and NGC 6397) roughly spanning the whole range of metallicities of the galactic globular cluster system. The analysis of this newly acquired material reveals no significant evidence of star-to-star variation of the [Fe/H] ratio in these three clusters. Moreover, a large set of high quality literature data (equivalent widths from high dispersion CCD spectra) was re-analyzed in an homogeneous and self-consistent way to integrate our observations and derive new metal abundances for more than 160 bright red giants in 24 globular clusters (i.e. about 16% of the known population of galactic globulars). This set was then used to define a new metallicity scale for globular clusters which is the result of high quality, direct spectroscopic data, of new and updated model atmospheres from the grid of Kurucz (1992), and of a careful fine abundance analysis; this last, in turn, is based on a common set of both atomic and atmospheric parameters for all the stars examined.1997A&AS..121...95Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/121/95CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/121/95https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/121/95http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/121/95https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/121/95https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/121/95http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/121/95GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+AS/121/95/table9Atmospheric parameters and abundance analysisNGCNGC designationmeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.idcharSourceSource for equivalent widthmeta.notecharTeffEffective Temperature (K)Kphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloat[A/H]Abundancelog(Sun)phys.abundfloatVelMicroturbulent velocitieskm/sphys.velocfloatnFeINumber of FeI lines usedmeta.numberintlogn(FeI)Absolute number density abundances of FeImeta.idfloate_logn(FeI)Sigma for Fe I abundancesstat.errorfloatnFeII? Number of FeII lines usedmeta.numberintnullablelogn(FeII)? Absolute number density abundances of FeIImeta.idfloatnullablee_logn(FeII)? Sigma for Fe II abundancesstat.errorfloatnullable[Fe/H]Metallicityphys.abund.Zfloat