J/MNRAS/455/199ivo://CDS.VizieR/J/MNRAS/455/199doi:10.26093/cds/vizier.74550199CDSDa Costa G.S.2024-08-15T20:16:41Z2016-10-06T13:42:19ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsglobular-star-clustersline-intensitiesradial-velocityMeasurements are presented and analysed of the strength of the CaII triplet lines in red giants in Galactic globular and open clusters, and in a sample of red giants in the LMC disc that have significantly different [Ca/Fe] abundance ratios to the Galactic objects. The Galactic objects are used to generate a calibration between CaII triplet line strength and [Fe/H], which is then used to estimate [Fe/H]CaT for the LMC stars. The values are then compared with the [Fe/H]spec determinations from high-dispersion spectroscopy. After allowance for a small systematic offset, the two abundance determinations are in excellent agreement. Further, as found in earlier studies, the difference is only a very weak function of the [Ca/Fe] ratio. For example, changing [Ca/Fe] from +0.3 to -0.2 causes the CaII-based abundance to underestimate [Fe/H]spec by only ~0.15dex, assuming a Galactic calibration. Consequently, the CaII triplet approach to metallicity determinations can be used without significant bias to study stellar systems that have substantially different chemical evolution histories.2016MNRAS.455..199Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/455/199CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/480/379 : Abundances of 59 red giants in LMC (Pompeia+, 2008)J/A+A/560/A44 : Abundances of LMC bar and disk stars (Van der Swaelmen+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/455/199https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/455/199http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/455/199https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/455/199https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/455/199http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/455/199GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/455/199/clusters (List of studied clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/455/199/clusters?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/455/199/clusters?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/455/199/clusters?GETtext/xml+votable180.050000true132.82511.80.005555555555555556Cone search capability for table J/MNRAS/455/199/table3 (Observational data for cluster member stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/455/199/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/455/199/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/455/199/table3?GETtext/xml+votable180.050000true132.5512511.85680560.0055555555555555566/4298 16647 16658 21017 33321 33323 39129 39131 39642 48434https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/455/199?format=asciidefaultJ/MNRAS/455/199/clustersList of studied clustersClusterCluster namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Simbad right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Simbad declination (J2000)pos.eq.dec;meta.mainClCluster abbreviation for stars in table3meta.idcharJ/MNRAS/455/199/table3Observational data for cluster member starsSimbadNameSimbad column added by the CDSmeta.idcharIDStar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.VfloatW(8542)Reduced equivalent width of CaII 8542{AA} line (1)0.1nmspect.line.eqWidthfloatW(8662)Reduced equivalent width of CaII 8662{AA} line (1)0.1nmspect.line.eqWidthfloatRVRadial velocitykm/sphys.veloc;pos.heliocentricfloat