J/A+A/689/A201ivo://CDS.VizieR/J/A+A/689/A201doi:10.26093/cds/vizier.36890201CDSSestito F.Vitali S.Jofre P.Venn K.A.Aguado D.S.Aguilera-Gomez C.,Ardern-Arentsen A.de Brito Silva D.Carlberg R.Eldridge C.J.L.,Gran F.Hill V.Jablonka P.Kordopatis G.Martin N.F.Matsuno T.,Rusterucci S.Starkenburg E.Viswanathan A.2025-04-16T20:01:26Z2024-09-13T11:15:24ZCDS support team

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

cds-question@unistra.frgalaxieschemically-peculiar-starschemical-abundancesvisible-astronomyThe most metal-poor stars provide valuable insights into the early chemical enrichment history of a system, carrying the chemical imprints of the first generations of supernovae. The most metal-poor region of the Sagittarius dwarf galaxy remains inadequately observed and characterised. To date, only 4 stars with [Fe/H]<-2.0 have been chemically analysed with high-resolution spectroscopy. In this study, we present the most extensive chemical abundance analysis of 12 low-metallicity stars with metallicities down to [Fe/H]=-3.26 and located in the main body of Sagittarius. These targets, selected from the Pristine Inner Galaxy Survey, were observed using the MIKE high-resolution spectrograph at the Magellan-Clay telescope, which allowed us to measure up to 17 chemical species. The chemical composition of these stars reflects the imprint of a variety of type II supernovae (SNe II). A combination of low- to intermediate-mass highenergy SNe and hypernovae (~10-70M_{sun}_) is required to account for the abundance patterns of the lighter elements up to the Fe-peak. The trend of the heavy elements suggests the involvement of compact binary merger events and fast-rotating (up to 300km/s) intermediate-mass to massive metal-poor stars (~25-120M_{sun}_) that are the sources of rapid and slow processes, respectively. Additionally, asymptotic giant branch stars contribute to a wide dispersion of [Ba/Mg] and [Ba/Eu]. The absence of an -knee in our data indicates that type Ia supernovae did not contribute in the very metal-poor region ([Fe/H]<=-2.0). However, they might have started to pollute the interstellar medium at [Fe/H]>-2.0, given the relatively low [Co/Fe] in this metallicity region.2024A&A...689A.201Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/689/A201CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/530/3391 : PIGS VIII (Ardern-Arentsen+, 2024)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/689/A201https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/689/A201http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/689/A201https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/689/A201https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/689/A201http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/689/A201GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/689/A201/table1 (Pristine names, Gaia informations, and log of the observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/689/A201/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/689/A201/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/689/A201/table1?GETtext/xml+votable180.050000true281.13275-29.529160.0055555555555555566/28928 47863 47869 48012 48034 48038 48040-48041 480431.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/689/A201?format=asciiOpticaldefaultJ/A+A/689/A201/table1Pristine names, Gaia informations, and log of the observationsTexpTotal exposure timestime.duration;obs.exposureintS/NS/N at the MgI Triplet region (~5180{AA})stat.snrintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAllDisplay all datameta.ref.urlcharSNameShort name (PHHMMSS+DDMMSS)meta.idcharPIGSPIGS name (Pristine_HHMMSs.ss+DDMMSS.s)meta.id;meta.maincharGaiaDR3Gaia DR3 source idmeta.idRAJ2000right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainSimbadSimbad column added by the CDSmeta.ref.urlcharGmagGaia DR3 G magnitudemagphot.mag;em.optfloatBP-RPGaia DR3 BP-RP colour indexmagphot.color;em.opt.B;em.opt.RfloatAVReddening (G1)magphys.absorptionfloatJ/A+A/689/A201/table2Stellar parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAllDisplay all datameta.ref.urlcharSNameShort name (PHHMMSS+DDMMSS)meta.id;meta.maincharRVRadial velocitykm/sphys.veloc;pos.heliocentricfloate_RVRadial velocity errorkm/sstat.errorfloate_[Fe/H]Metallicity errorstat.error;phys.abund.FefloatTeffEffective temperatureKphys.temperature.effectiveinte_TeffEffective temperature errorKstat.error;phys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloate_loggSurface gravity errorlog(cm.s**-2)stat.errorfloat[Fe/H]Metallicityphys.abund.ZfloatJ/A+A/689/A201/xhstpa[X/H] stellar parametersFeII? Abundance FeIIphys.abundfloatnullableNaIAbundance NaIphys.abunddoubleo_KI[0/2] Number of lines for element KImeta.numberfloatCaIAbundance CaIphys.abundfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAllDisplay all dataphys.abundcharPIGSPIGS name (Pristine_HHMMSs.ss+DDMMSS.s)meta.id;meta.maincharFeIAbundance FeIphys.abunddoubles_FeIDispersion on FeIphys.abundfloato_FeI[11/188] Number of lines for element FeImeta.numberints_FeII? Dispersion on FeIIphys.abundfloatnullableo_FeII[0/25]? Number of lines for element FeIImeta.numberintnullables_NaIDispersion on NaIphys.abundfloato_NaI[2/5] Number of lines for element NaImeta.numberintMgIAbundance MgIphys.abunddoubles_MgIDispersion on MgIphys.abundfloato_MgI[2/7] Number of lines for element MgImeta.numberintAlI? Abundance AlIphys.abundfloatnullables_AlI? Dispersion on AlIphys.abundfloatnullableo_AlI[0/2]? Number of lines for element AlImeta.numberintnullableSiI? Abundance SiIphys.abunddoublenullables_SiI? Dispersion on SiIphys.abundfloatnullableo_SiI[1/10]? of lines for element SiImeta.numberintnullableKI? Abundance KIphys.abundfloatnullables_KI? Dispersion on KIphys.abundfloatnullables_CaIDispersion on CaIphys.abundfloato_CaI[3/23] Number of lines for element CaImeta.numberintScII? Abundance ScIIphys.abunddoublenullables_ScII? Dispersion on ScIIphys.abundfloatnullableo_ScII[0/8]? Number of lines for element ScIImeta.numberintnullableTiI? Abundance TiIphys.abundfloatnullables_TiI? Dispersion on TiIphys.abundfloatnullableo_TiI[2/21]? of lines for element TiImeta.numberintnullableTiII? Abundance TiIIphys.abunddoublenullables_TiII? Dispersion on TiIIphys.abundfloatnullableo_TiII[0/37]? of lines for element TiIImeta.numberintnullableCrIAbundance CrIphys.abunddoubles_CrIDispersion on CrIphys.abundfloato_CrI[1/11]Number of lines for element CrImeta.numberintMnI? Abundance MnIphys.abunddoublenullables_MnI? Dispersion on MnIphys.abundfloatnullableo_MnI[0/7]? of lines for element MnImeta.numberintnullableCoI? Abundance CoIphys.abunddoublenullables_CoI? Dispersion on CoIphys.abundfloatnullableo_CoI[0/4]? of lines for element CoImeta.numberintnullableNiIAbundance NiIphys.abunddoubles_NiIDispersion on NiIphys.abundfloato_NiI[1/11] Number of lines for element NiImeta.numberintZnI? Abundance ZnIphys.abunddoublenullables_ZnI? Dispersion on ZnIphys.abundfloatnullableo_ZnI[0/2]? Number of lines for element ZnImeta.numberintnullableSrII? Abundance SrIIphys.abundfloatnullables_SrII? Dispersion on SrIIphys.abundfloatnullableo_SrII[0/2]? Number of lines for element SrIImeta.numberintnullableYII? Abundance YIIphys.abunddoublenullables_YII? Dispersion on YIIphys.abundfloatnullableo_YII[0/5]? Number of lines for element YIImeta.numberintnullableBaIIAbundance BaIIphys.abundfloats_BaIIDispersion on BaIIphys.abundfloato_BaII[2/5] Number of lines for element BaIImeta.numberint[Fe/H]FFERRE [Fe/H]phys.abundfloatAV? Reddening (G1)phys.absorptionfloatnullableTeffEffective temperatureKphys.temperature.effectivedoublee_TeffEffective temperature errorKstat.error;phys.temperature.effectivedoubleloggSurface gravitylog(cm.s**-2)phys.abunddoublee_loggSurface gravity errorlog(cm.s**-2)stat.errordoubleJ/A+A/689/A201/xfestpa[X/Fe] stellar parameterse_[Si/Fe]? rms uncertainty on [Si/Fe]stat.error;phys.abunddoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAllDisplay all datameta.ref.urlchar[Fe/H]Abundance [Fe/H]phys.abund.Fedoublee_[Fe/H]rms uncertainty on [Fe/H]stat.error;phys.abund.Fedouble[C/Fe]? Abundance [C/Fe]phys.abundfloatnullable[C/Fe]c? Corrected abundance [C/Fe]phys.abundfloatnullable[Na/Fe]Abundance [Na/Fe]phys.abunddoublee_[Na/Fe]rms uncertainty on [Na/Fe]stat.error;phys.abunddouble[Mg/Fe]Abundance [Mg/Fe]phys.abunddoublee_[Mg/Fe]rms uncertainty on [Mg/Fe]stat.error;phys.abunddouble[Al/Fe]? Abundance [Al/Fe]phys.abunddoublenullablee_[Al/Fe]? rms uncertainty on [Al/Fe]stat.error;phys.abunddoublenullable[Si/Fe]? Abundance [Si/Fe]phys.abunddoublenullable[K/Fe]Abundance [K/Fe]phys.abunddoublee_[K/Fe]rms uncertainty on [K/Fe]stat.error;phys.abunddouble[Ca/Fe]Abundance [Ca/Fe]phys.abunddoublee_[Ca/Fe]rms uncertainty on [Ca/Fe]stat.error;phys.abunddouble[Sc/Fe]? Abundance [Sc/Fe]phys.abunddoublenullablee_[Sc/Fe]? rms uncertainty on [Sc/Fe]stat.error;phys.abunddoublenullable[Ti/Fe]? Abundance [Ti/Fe]phys.abunddoublenullablee_[Ti/Fe]? rms uncertainty on [Ti/Fe]stat.error;phys.abunddoublenullable[Cr/Fe]Abundance [Cr/Fe]phys.abunddoublee_[Cr/Fe]rms uncertainty on [Cr/Fe]stat.error;phys.abunddouble[Mn/Fe]? Abundance [Mn/Fe]phys.abunddoublenullablee_[Mn/Fe]? rms uncertainty on [Mn/Fe]stat.error;phys.abunddoublenullable[Co/Fe]? Abundance [Co/Fe]phys.abunddoublenullablee_[Co/Fe]? rms uncertainty on [Co/Fe]stat.error;phys.abunddoublenullable[Ni/Fe]Abundance [Ni/Fe]phys.abunddoublee_[Ni/Fe]rms uncertainty on [Ni/Fe]stat.error;phys.abunddouble[Zn/Fe]? Abundance [Zn/Fe]phys.abunddoublenullablee_[Zn/Fe]? rms uncertainty on [Zn/Fe]stat.error;phys.abunddoublenullable[Sr/Fe]? Abundance [Sr/Fe]phys.abunddoublenullablee_[Sr/Fe]? rms uncertainty on [Sr/Fe]stat.error;phys.abunddoublenullable[Y/Fe]? Abundance [Y/Fe]phys.abunddoublenullablee_[Y/Fe]? rms uncertainty on [Y/Fe]stat.error;phys.abunddoublenullable[Ba/Fe]Abundance [Ba/Fe]phys.abunddoublee_[Ba/Fe]rms uncertainty on [Ba/Fe]stat.error;phys.abunddouble[Eu/Fe]? Abundance [Eu/Fe]phys.abundfloatnullablee_[Eu/Fe]? rms uncertainty on [Eu/Fe]stat.error;phys.abundfloatnullableTeffEffective temperatureKphys.temperature.effectivedoublee_TeffEffective temperature errorKstat.error;phys.temperature.effectivedoubleloggSurface gravitylog(cm.s**-2)phys.gravitydoublee_loggSurface gravity errorlog(cm.s**-2)stat.errordoublePIGSPIGS name (Pristine_HHMMSs.ss+DDMMSS.s)meta.id;meta.mainchar