Battaglia, G.Irwin, M.Tolstoy, E.Hill, V.Helmi, A.Letarte, B.Jablonka, P.2010-11-302010-11-302010-11-30200810.1111/j.1365-2966.2007.12532.xhttps://infoscience.epfl.ch/handle/20.500.14299/61670WOS:000251813700026We demonstrate that low-resolution Ca II triplet (CaT) spectroscopic estimates of the overall metallicity ([Fe/H]) of individual red giant branch (RGB) stars in two nearby dwarf spheroidal galaxies (dSphs) agree to +/- 0.1-0.2 dex with detailed high-resolution spectroscopic determinations for the same stars over the range-2.5 <[Fe/H]<-0.5. For this study, we used a sample of 129 stars observed in low- and high-resolution modes with VLT/FLAMES in the Sculptor and Fornax dSphs. We also present the data-reduction steps we used in our low-resolution analysis and show that the typical accuracy of our velocity and CaT [Fe/H] measurement is similar to 2 km s(-1) and 0.1 dex, respectively. We conclude that CaT-[Fe/H] relations calibrated on globular clusters can be applied with confidence to RGB stars in composite stellar populations over the range -2.5 < [Fe/H] < - 0.5.techniques : spectroscopicstars : abundancesgalaxies : dwarfgalaxies : star clustersDwarf Spheroidal GalaxyCluster Metallicity ScaleGlobular-ClustersIi TripletMilky-WayAbundancesAgeParametersCatalogtext::journal::journal article::research article