J/A+A/699/A356ivo://CDS.VizieR/J/A+A/699/A356doi:10.26093/cds/vizier/bc-nv/ldfgCDSLiberatori A.Alvarez Garay D.A.Palla M.Mucciarelli A.Bellazzini M.,Romano D.2026-08-28T12:50:39Z2025-07-22T10:04:14ZCDS support team

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

cds-question@unistra.frgalaxiesgiant-starschemical-abundancesvisible-astronomyWe present the chemical composition of a sample of 37 red giant branch (RGB) stars belonging to the main body of the remnant of the Sagittarius (Sgr) dwarf spheroidal galaxy. All stars were observed with the FLAMES-UVES high-resolution spectrograph. Twenty-three new targets were selected along the blue side of the RGB of Sgr, but outside the galaxy stellar nucleus, in order to avoid contamination by the stars of the metal-poor globular cluster M54. Additionally, we re-analysed archival spectra of 14 targets located on the red RGB. For this sample, we derive the abundances of 21 chemical species (from oxygen to europium) representing different nucleosynthetic sites. The sample covers a large range of metallicities, from [Fe/H]~-2 to ~-0.4dex, and we can identify the transition between the enrichment phases dominated by core-collapse and Type Ia supernovae. The observed [alpha/Fe] trend suggests a knee occurring at [Fe/H]~-1.5-1.3dex, compatible with the rather low star formation efficiency of Sgr. At lower [Fe/H], Sgr stars exhibit a chemical composition compatible with Milky Way stars of similar [Fe/H]. The only relevant exceptions are [Mn/Fe], [Zn/Fe], and [Eu/Fe]. Instead, at [Fe/H] higher than -1.5/-1.3dex, the chemical pattern of Sgr significantly deviates from that of the Milky Way for almost all the elements analysed in this study. Some of the abundance patterns reveal a lower contribution by very massive stars exploding as hypernovae (e.g. [Mn/Fe], [Zn/Fe]), a higher contribution by sub-Chandrasekhar progenitors of Type Ia supernovae (e.g. [Ni/Fe]), and a high production efficiency of rapid neutron-capture elements ([Eu/Fe]).2025A&A...699A.356Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/699/A356CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/699/A356https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/699/A356http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/699/A356https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/699/A356https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/699/A356http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/699/A356GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/699/A356/tablea1 (Sagittarius spectroscopic targets: photometric data, atmospheric parameters, [Fe/H] and RVs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/699/A356/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/699/A356/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/699/A356/tablea1?GETtext/xml+votable180.050000true283.81293381264-30.244030884920.0055555555555555566/48034-48035 480411.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/699/A356?format=asciiOpticaldefaultJ/A+A/699/A356/tablea1Sagittarius spectroscopic targets: photometric data, atmospheric parameters, [Fe/H] and RVsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR3Star Name (Gaia DR3 source_id)meta.id;meta.mainRA_ICRSRigh ascension (ICRS) at Ep=2016.0degpos.eq.ra;meta.mainSimbadSimbad column added by the CDSmeta.ref.urlcharDE_ICRSDeclination (ICRS) at Ep=2016.0degpos.eq.dec;meta.mainGmagGaia DR3 G magnitudemagphot.mag;em.optfloatBP-RPGaia DR3 BP-RP colourmagphot.color;em.opt.B;em.opt.RfloatTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloatvturbMicroturbulent velocitykm/sphys.velocfloatRVRadial velocity (Errors are 0.1km/s)km/sphys.veloc;pos.heliocentricfloat[Fe/H]Metallicityphys.abund.Zfloate_[Fe/H]Metallicity errorstat.error;phys.abund.FefloatM21? Identification number of the stars in common with Minelli et al. (2021ApJ...910..114M)meta.idintnullableGAIADR3Display the Gaia DR3 datameta.ref.urlcharJ/A+A/699/A356/tableb1Main information of the observed targetsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaDR3Star Name (Gaia DR3 source_id)meta.id;meta.main[FeI/H]Abundance relative to the Sun for FeIphys.abundfloate_[FeI/H]Uncertainty on the abundance for FeIstat.error;phys.abundfloat[OI/Fe]? Abundance relative to the Sun for OIphys.abundfloatnullablee_[OI/Fe]? Uncertainty on the abundance for OIstat.error;phys.abundfloatnullable[NaI/Fe]? Abundance relative to the Sun for NaIphys.abundfloatnullablee_[NaI/Fe]Uncertainty on the abundance for NaIstat.error;phys.abundfloat[MgI/Fe]Abundance relative to the Sun for MgIphys.abundfloate_[MgI/Fe]Uncertainty on the abundance for MgIstat.error;phys.abundfloat[AlI/Fe]? Abundance relative to the Sun for AlIphys.abundfloatnullablee_[AlI/Fe]? Uncertainty on the abundance for AlIstat.error;phys.abundfloatnullable[SiI/Fe]? Abundance relative to the Sun for SiIphys.abundfloatnullablee_[SiI/Fe]? Uncertainty on the abundance for SiIstat.error;phys.abundfloatnullable[CaI/Fe]Abundance relative to the Sun for CaIphys.abundfloate_[CaI/Fe]Uncertainty on the abundance for CaIstat.error;phys.abundfloat[ScII/Fe]Abundance relative to the Sun for ScIIphys.abundfloate_[ScII/Fe]Uncertainty on the abundance for ScIIstat.error;phys.abundfloat[TiI/Fe]Abundance relative to the Sun for TiIphys.abundfloate_[TiI/Fe]Uncertainty on the abundance for TiIstat.error;phys.abundfloat[VI/Fe]Abundance relative to the Sun for VIphys.abundfloate_[VI/Fe]Uncertainty on the abundance for VIstat.error;phys.abundfloat[CrI/Fe]Abundance relative to the Sun for CrIphys.abundfloate_[CrI/Fe]Uncertainty on the abundance for CrIstat.error;phys.abundfloat[MnI/Fe]Abundance relative to the Sun for MnIphys.abundfloate_[MnI/Fe]Uncertainty on the abundance for MnIstat.error;phys.abundfloat[CoI/Fe]Abundance relative to the Sun for CoIphys.abundfloate_[CoI/Fe]Uncertainty on the abundance for CoIstat.error;phys.abundfloat[NiI/Fe]Abundance relative to the Sun for NiIphys.abundfloate_[NiI/Fe]Uncertainty on the abundance for NiIstat.error;phys.abundfloat[CuI/Fe]? Abundance relative to the Sun for CuIphys.abundfloatnullablee_[CuI/Fe]Uncertainty on the abundance for CuIstat.error;phys.abundfloat[ZnI/Fe]? Abundance relative to the Sun for ZnIphys.abundfloatnullablee_[ZnI/Fe]Uncertainty on the abundance for ZnIstat.error;phys.abundfloat[ZrI/Fe]? Abundance relative to the Sun for ZrIphys.abundfloatnullablee_[ZrI/Fe]? Uncertainty on the abundance for ZrIstat.error;phys.abundfloatnullable[BaII/Fe]Abundance relative to the Sun for BaIIphys.abundfloate_[BaII/Fe]Uncertainty on the abundance for BaIIstat.error;phys.abundfloat[LaII/Fe]? Abundance relative to the Sun for LaIIphys.abundfloatnullablee_[LaII/Fe]? Uncertainty on the abundance for LaIIstat.error;phys.abundfloatnullable[NdII/Fe]Abundance relative to the Sun for NdIIphys.abundfloate_[NdII/Fe]Uncertainty on the abundance for NdIIstat.error;phys.abundfloat[EuII/Fe]Abundance relative to the Sun for EuIIphys.abundfloate_[EuII/Fe]Uncertainty on the abundance for EuIIstat.error;phys.abundfloat