J/A+A/654/A170ivo://CDS.VizieR/J/A+A/654/A170doi:10.26093/cds/vizier.36540170CDSMatas Pinto A.M.Spite M.Caffau E.Bonifacio P.Sbordone L.,Sivarani T.Steffen M.Spite F.Francois P.Di Matteo P.2022-09-21T08:43:07Z2021-10-27T09:03:38ZCDS support team

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

cds-question@unistra.frpopulation-ii-starschemical-abundancesline-intensitiesThe study of old, metal-poor stars deepens our knowledge on the early stages of the universe. In particular, the study of these stars gives us a valuable insight into the masses of the first massive stars and their emission of ionising photons. We present a detailed chemical analysis and determination of the kinematic and orbital properties of a sample of 11 dwarf stars. These are metal-poor stars, and a few of them present a low lithium content. We inspected whether the other elements also present anomalies. We analysed the high-resolution UVES spectra of a few metal-poor stars using the Turbospectrum code to synthesise spectral lines profiles. This allowed us to derive a detailed chemical analysis of Fe, C, Li, Na, Mg, Al, Si, CaI, CaII, ScII, TiII, Cr, Mn, Co, Ni, Sr, and Ba. We find excellent coherence with the reference metal-poor First Stars sample. The lithium-poor stars do not present any anomaly of the abundance of the elements other than lithium. Among the Li-poor stars, we show that CS 22882-027 is very probably a blue-straggler. The star CS 30302-145, which has a Li abundance compatible with the plateau, has a very low Si abundance and a high Mn abundance. In many aspects, it is similar to the {alpha}-poor star HE 1424-0241, but it is less extreme. It could have been formed in a satellite galaxy and later been accreted by our Galaxy. This hypothesis is also supported by its kinematics.2021A&A...654A.170Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/654/A170CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/522/A26 : Fe Abundances in metal-poor stars (Sbordone+ 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/654/A170https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/654/A170http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/654/A170https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/654/A170https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/654/A170http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/654/A170GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/654/A170/stars (List of studied stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/654/A170/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/654/A170/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/654/A170/stars?GETtext/xml+votable180.050000true142.230625-5.361250.0055555555555555566/19239 27176 35527 35579 35710 35775 44607 46871 47040 47231 48766https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/654/A170?format=asciidefaultJ/A+A/654/A170/starsList of studied starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar identifiermeta.id;meta.maincharRAJ2000Simbad Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainSNameSimbad namemeta.idcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/654/A170/tableAbundancesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar identifiermeta.id;meta.maincharlambdaWavelength {lambda}, in {AA}0.1nmem.wldoubleIonSpecies identifierphys.atmol.ionStagecharEPExcitation PotentialeVphys.atmol.excitationfloatloggfLog of the oscillator strengthphys.atmol.oscStrengthfloatEW? Equivalent width, in m{AA}1e-13mspect.line.eqWidthfloatnullablen_EW[syn ] syn for spectrum synthesismeta.notecharAbundAbundancephys.abundfloat