J/MNRAS/383/183ivo://CDS.VizieR/J/MNRAS/383/183doi:10.26093/cds/vizier.73830183CDSBattaglia G.Irwin M.Tolstoy E.Hill V.Helmi A.Letarte B.,Jablonka P.2024-07-05T20:16:04Z2008-06-07T17:18:12ZCDS support team

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

cds-question@unistra.frgalaxiesglobular-star-clustersgiant-starsspectroscopyWe demonstrate that low-resolution CaII 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 +/-0.1-0.2dex 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 ~2km/s and 0.1dex, 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]<-0.5.2008MNRAS.383..183Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/383/183CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/327/918 : CaII in extragalactic red giants (Tolstoy+, 2001)J/A+A/459/423 : VI and [Fe/H] of Fornax dSph RGB stars (Battaglia+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/383/183https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/383/183http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/383/183https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/383/183https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/383/183http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/383/183GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/383/183/table3 (Sample of the relevant data for the stars in the globular clusters NGC 104, NGC 3201, NGC 4590 and NGC 5904 observed with VLT/FLAMES at low resolution, and that we used in the analysis of the CaT-[Fe/H] calibration.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/383/183/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/383/183/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/383/183/table3?GETtext/xml+votable180.050000true5.9237917-72.08405560.005555555555555556Cone search capability for table J/MNRAS/383/183/table4 (Sample of the relevant data for the stars observed with VLT/FLAMES at both low- and high-resolution and in the Sculptor and Fornax dSphs, and used in the analysis of the CaT-[Fe/H] calibration.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/383/183/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/383/183/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/383/183/table4?GETtext/xml+votable180.050000true15.0112083-33.50702780.0055555555555555566/24843 31416-31417 33321 35549 35720 35969 38465https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/383/183?format=asciiOpticaldefaultJ/MNRAS/383/183/table3Sample of the relevant data for the stars in the globular clusters NGC 104, NGC 3201, NGC 4590 and NGC 5904 observed with VLT/FLAMES at low resolution, and that we used in the analysis of the CaT-[Fe/H] calibration.RAJ2000Right ascension (J2000) (2)pos.eq.ra;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterGlobular cluster namemeta.id.parentcharGB07Star identification (1)meta.id;meta.maincharDEJ2000Declination (J2000) (2)pos.eq.dec;meta.mainVmagV magnitude (2)magphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmag (2)magstat.error;phot.mag;em.opt.VfloatHVHeliocentric velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HVrms uncertainty on HVkm/sstat.errorfloatEWSummed Ca triplet equivalent width (EW2+EW3)0.1nmspect.line.eqWidthfloate_EWrms uncertainty on EW0.1nmstat.error;spect.line.eqWidthfloat[Fe/H]LRLow-resolution metallicity (G1)log(Sun)phys.abund.Fefloate_[Fe/H]LRrms uncertainty on [Fe/H]LRlog(Sun)stat.error;phys.abund.FefloatJ/MNRAS/383/183/table4Sample of the relevant data for the stars observed with VLT/FLAMES at both low- and high-resolution and in the Sculptor and Fornax dSphs, and used in the analysis of the CaT-[Fe/H] calibration.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGalaxyGalaxy name (Sculptor or Fornax)meta.id.parentcharGB07Star identification (1)meta.id;meta.maincharRAJ2000Right ascension (J2000) (2)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (2)pos.eq.dec;meta.mainVmagV magnitude (2)magphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmag (2)magstat.error;phot.mag;em.opt.VfloatHVHeliocentric velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HVrms uncertainty on HVkm/sstat.errorfloatEWSummed Ca triplet equivalent width (EW2+EW3)0.1nmspect.line.eqWidthfloate_EWrms uncertainty on EW0.1nmstat.error;spect.line.eqWidthfloat[Fe/H]LRMetallicity derived from low-resolution observationslog(Sun)phys.abund.Fefloate_[Fe/H]LRrms uncertainty on [Fe/H]LRlog(Sun)stat.error;phys.abund.Fefloat[Fe/H]HRMetallicity derived from high-resolution observations (G1)log(Sun)phys.abund.Fefloate_[Fe/H]HRrms uncertainty on [Fe/H]HRlog(Sun)stat.error;phys.abund.Fefloat[Ca/Fe]? Ca abundance derived from high resolution observations (3)log(Sun)phys.abundfloatnullablee_[Ca/Fe]rms uncertainty on [Ca/Fe]HRlog(Sun)stat.error;phys.abundfloat