J/MNRAS/488/2283ivo://CDS.VizieR/J/MNRAS/488/2283doi:10.26093/cds/vizier.74882283CDSLucey M.Hawkins K.Ness M.Asplund M.Bensby T.Casagrande L.,Feltzing S.Freeman K.C.Kobayashi C.Marino A.F.2024-08-20T20:12:01Z2020-06-25T07:18:06ZCDS support team

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

cds-question@unistra.frsurveyspopulation-ii-starschemical-abundancesradial-velocityChemistry and kinematic studies can determine the origins of stellar population across the Milky Way. The metallicity distribution function of the bulge indicates that it comprises multiple populations, the more metal-poor end of which is particularly poorly understood. It is currently unknown if metal-poor bulge stars ([Fe/H]<-1dex) are part of the stellar halo in the inner most region, or a distinct bulge population or a combination of these. Cosmological simulations also indicate that the metal-poor bulge stars may be the oldest stars in the Galaxy. In this study, we successfully target metal-poor bulge stars selected using SkyMapper photometry. We determine the stellar parameters of 26 stars and their elemental abundances for 22 elements using R~47000 VLT/UVES spectra and contrast their elemental properties with that of other Galactic stellar populations. We find that the elemental abundances we derive for our metal-poor bulge stars have lower overall scatter than typically found in the halo. This indicates that these stars may be a distinct population confined to the bulge. If these stars are, alternatively, part of the inner-most distribution of the halo, this indicates that the halo is more chemically homogeneous at small Galactic radii than at large radii. We also find two stars whose chemistry is consistent with second-generation globular cluster stars. This paper is the first part of the Chemical Origins of Metal-poor Bulge Stars (COMBS) survey that will chemo-dynamically characterize the metal-poor bulge population.2019MNRAS.488.2283Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/488/2283CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/488/2283https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/488/2283http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/488/2283https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/488/2283https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/488/2283http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/488/2283GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/488/2283/table2 (Observational properties of our target stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/488/2283/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/488/2283/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/488/2283/table2?GETtext/xml+votable180.050000true276.06904-33.545190.0055555555555555566/28737 28739 28742 28792 28794 29026-29027 47803 478061.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/488/2283?format=asciidefaultJ/MNRAS/488/2283/table2Observational properties of our target starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar identification numbermeta.id;meta.mainfloat2MASS2MASS name (HHMMSSss=DDMMSSs)meta.idcharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainGLON[] Galactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latfloatGmagGaia G magnitudemagphot.mag;em.optfloatNspecNumber of co-added spectrameta.numberintRVMean measured radial velocity of those spectrakm/sphys.veloc;pos.heliocentricfloate_RVrms uncertainty on RVkm/sstat.errorfloatRVscatterScatter between spectrakm/sstat.stdevfloatSNRLSignal-to-noise ratio for the lower/blue chippixel**-1stat.snrintSimbadSimbad column added by the CDSmeta.ref.urlcharJ/MNRAS/488/2283/paramParameters (table A1)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar identification numbermeta.id;meta.mainfloatSNRLSignal-to-noise ratio for lower chippixel**-1stat.snrfloatTeffEffective temperatureKphys.temperature.effectivefloate_TeffError on the effective temperatureKstat.error;phys.temperature.effectivefloatlog(g)Surface gravitylog(cm.s**-2)phys.gravityfloate_log(g)Error on the surface gravitylog(cm.s**-2)stat.errorfloatvmicroMicroturbulence velocitykm/sphys.veloc.microTurbfloate_vmicroError on the microturbulence velocitykm/sstat.errorfloat[Fe/H]Metallicityphys.abund.Zfloate_[Fe/H]Error on the metallicitystat.error;phys.abund.Fefloat[Mg/Fe]? Abundance [Mg/Fe]phys.abundfloatnullablee_[Mg/Fe]? Error on abundance [Mg/Fe]stat.error;phys.abundfloatnullable[Si/Fe]Abundance [Si/Fe]phys.abundfloate_[Si/Fe]Error on abundance [Si/Fe]stat.error;phys.abundfloat[Ca/Fe]? Abundance [Ca/Fe]phys.abundfloatnullablee_[Ca/Fe]? Error on abundance [Ca/Fe]stat.error;phys.abundfloatnullable[Ti/Fe]? Abundance [Ti/Fe]phys.abundfloatnullablee_[Ti/Fe]? Error on abundance [Ti/Fe]stat.error;phys.abundfloatnullable[Mn/Fe]? Abundance [Mn/Fe]phys.abundfloatnullablee_[Mn/Fe]? Error on abundance [Mn/Fe]stat.error;phys.abundfloatnullable[Co/Fe]? Abundance [Co/Fe]phys.abundfloatnullablee_[Co/Fe]? Error on abundance [Co/Fe]stat.error;phys.abundfloatnullable[O/Fe]? Abundance [O/Fe]phys.abundfloatnullablee_[O/Fe]? Error on abundance [O/Fe]stat.error;phys.abundfloatnullable[Li/Fe]? Abundance [Li/Fe]phys.abundfloatnullablee_[Li/Fe]? Error on abundance [Li/Fe]stat.error;phys.abundfloatnullable[Cr/Fe]Abundance [Cr/Fe]phys.abundfloate_[Cr/Fe]Error on abundance [Cr/Fe]stat.error;phys.abundfloat[Cu/Fe]? Abundance [Cu/Fe]phys.abundfloatnullablee_[Cu/Fe]? Error on abundance [Cu/Fe]stat.error;phys.abundfloatnullable[La/Fe]? Abundance [La/Fe]phys.abundfloatnullablee_[La/Fe]? Error on abundance [La/Fe]stat.error;phys.abundfloatnullable[Al/Fe]? Abundance [Al/Fe]phys.abundfloatnullablee_[Al/Fe]? Error on abundance [Al/Fe]stat.error;phys.abundfloatnullable[Na/Fe]? Abundance [Na/Fe]phys.abundfloatnullablee_[Na/Fe]? Error on abundance [Na/Fe]stat.error;phys.abundfloatnullable[Ni/Fe]? Abundance [Ni/Fe]phys.abundfloatnullablee_[Ni/Fe]? Error on abundance [Ni/Fe]stat.error;phys.abundfloatnullable[Ba/Fe]? Abundance [Ba/Fe]phys.abundfloatnullablee_[Ba/Fe]? Error on abundance [Ba/Fe]stat.error;phys.abundfloatnullable[Sr/Fe]? Abundance [Sr/Fe]phys.abundfloatnullablee_[Sr/Fe]? Error on abundance [Sr/Fe]stat.error;phys.abundfloatnullable[Y/Fe]? Abundance [Y/Fe]phys.abundfloatnullablee_[Y/Fe]? Error on abundance [Y/Fe]stat.error;phys.abundfloatnullable[Eu/Fe]? Abundance [Eu/Fe]phys.abundfloatnullablee_[Eu/Fe]? Error on abundance [Eu/Fe]stat.error;phys.abundfloatnullable[V/Fe]? Abundance [V/Fe]phys.abundfloatnullablee_[V/Fe]? Error on abundance [V/Fe]stat.error;phys.abundfloatnullable[Sc/Fe]Abundance [Sc/Fe]phys.abundfloate_[Sc/Fe]Error on abundance [Sc/Fe]stat.error;phys.abundfloat[Zr/Fe]? Abundance [Zr/Fe]phys.abundfloatnullablee_[Zr/Fe]? Error on abundance [Zr/Fe]stat.error;phys.abundfloatnullable[Nd/Fe]? Abundance [Nd/Fe]phys.abundfloatnullablee_[Nd/Fe]? Error on abundance [Nd/Fe]stat.error;phys.abundfloatnullableJ/MNRAS/488/2283/abundLine abundances (table A2)ElElementphys.atmol.elementcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar identification numbermeta.id;meta.mainfloatlambdaWavelength0.1nmem.wlfloatlog(gf)Oscillator strengthphys.atmol.oscStrengthfloatchiExcitation potentialeVphys.atmol.excitationfloatepsilonlog(epsilon) abundancephys.abundfloatNLTE? NLTE correctionarith.factorfloatnullable