J/ApJ/905/20ivo://CDS.VizieR/J/ApJ/905/20doi:10.26093/cds/vizier.19050020CDSRasmussen K.C.Zepeda J.Beers T.C.Placco V.M.Depagne E.Frebel A.,Dietz S.Hartwig T.2022-09-30T22:25:39Z2022-06-13T13:45:44ZCDS support team

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

cds-question@unistra.frchemically-peculiar-starsvisible-astronomyspectroscopychemical-abundanceseffective-temperatureWe present the first release of a large-scale study of relatively bright (V<13.5) metal-poor stars observed with the Southern African Large Telescope (SALT), based on high-resolution spectra of 50 stars with a resolving power of R~40000 and S/N~20 per pixel at 4300{AA}. The elemental abundances of C, Sr, Ba, and Eu are reported, as well as several {alpha}-elements (Mg, Ca, Sc, Ti, and V) and iron-peak elements (Mn, Co, Ni, and Zn). We find a diverse array of abundance patterns, including several consistent with the signatures of carbon-enhanced metal-poor CEMP-i and CEMP-r stars. We find that 15 of 50 (30%) are carbon enhanced (with [C/Fe]>+0.70), and that a large fraction (26 of 50, 52%) are enhanced in r-process elements. Among the r-process-enhanced stars, five are strongly enhanced r-II ([Eu/Fe]>+1.0) stars (two of which are newly discovered) and 21 are newly discovered moderately enhanced r-I (+0.3<=[Eu/Fe]<=+1.0) stars. There are eight stars in our sample that, on the basis of their abundances and kinematics, are possible members of the metal-weak thick-disk population. We also compare our measured abundances to progenitor-enrichment models, and find that the abundance patterns for the majority of our stars can be attributed to a single (rather than multiple) enrichment event.2020ApJ...905...20Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/905/20CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/272 : RAVE 4th data release (Kordopatis+, 2013)III/279 : RAVE 5th data release (Kunder+, 2017)J/AJ/103/1987 : Stars of very low metal abundance (Beers+ 1992)J/MNRAS/404/1529 : s-process in low-metallicity stars (Bisterzo+, 2010)J/AJ/141/175 : Abundances in M15 RGB/RHB stars (Sobeck+, 2011)J/ApJ/769/57 : Equivalent widths of metal-poor stars (Frebel+, 2013)J/ApJ/797/21 : Carbon-enhanced metal-poor stars (Placco+, 2014)J/AJ/147/136 : Stars of very low metal abundance. VI. (Roederer+, 2014)J/ApJ/833/20 : Carbon-enhanced metal-poor star abundances (Yoon+, 2016)J/ApJ/835/81 : Bright metal-poor stars from HES Survey. II. (Beers+, 2017)J/A+A/618/A133 : Non standard s-process in rotating stars (Choplin+, 2018)J/ApJ/858/92 : RPA Southern Pilot Search of 107 Stars (Hansen+, 2018)J/AJ/155/256 : Spec. validation of RAVE metal-poor stars (Placco+, 2018)J/ApJ/868/110 : R-Process Alliance: 1st release in Gal. halo (Sakari+, 2018)J/ApJ/870/122 : Spectroscopy of low-metallicity stars (Placco+, 2019)J/ApJ/898/150 : High-res. MIKE obs. of metal-poor stars (Ezzeddine+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/905/20https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/905/20http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/905/20https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/905/20https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/905/20http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/905/20GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/905/20/stars (Stellar atmospheric parameters (Table 4), classification abundances (Table 5) and abundance ratios (Tables 6 and 7) for the program stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/905/20/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/905/20/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/905/20/stars?GETtext/xml+votable180.050000true22.3797131-16.01263750.0055555555555555566/17420 18683 21126 23107 24588 24657 25287 25431 25479 25486 25608 30858 31119 32981 33014 33030 34589 38397 39084 39141 39208 40306 41247 42263 43262 43635 43718 43996 44350 44427 44445 44447 44449 44500 45309 45743 45768 45838 45877 45984 46054 47172 47206 47544 47634 47776 48162 48603 48946 49027https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/905/20?format=asciiOpticaldefaultJ/ApJ/905/20/starsStellar atmospheric parameters (Table 4), classification abundances (Table 5) and abundance ratios (Tables 6 and 7) for the program starsSimbadNameSimbad column added by the CDSmeta.idcharnullablel_[C/Fe]Limit flag on [C/Fe]meta.code.error;phys.abundcharl_[C/Fe]corrLimit flag on [C/Fe]corrmeta.code.error;phys.abundcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAVEStellar identifier (JHHMMSS.s+DDMMSS)meta.id;meta.maincharprimaryTeff[4360/6115] Effective temperatureKphys.temperature.effectiveintlogg[0.6/4.25] log of surface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H][-2.92/-0.94] Metallicityphys.abund.Zfloatvt[1.25/3.3] Microturbulent velocitykm/sphys.velocfloatPPreviously observed star (link to Table 3)meta.ref.urlintnullableClassClass (1)src.classcharl_ACcorrLimit flag on ACcorrmeta.code.errorcharACcorr[5.92/8.1] Corrected absolute carbon abundance A(C)=log(NC/NH)+12phys.abundfloat[C/Fe][-0.48/1.44] Log C/Fe number abundance ratiophys.abundfloate_[C/Fe][0.25/0.25]? Uncertainty in [C/Fe]stat.error;phys.abundfloatnullable[C/Fe]corr[0.06/1.58]? Corrected, [C/Fe] (2)phys.abundfloatnullablee_[C/Fe]corr[0.2/0.3]? Uncertainty in [C/Fe]corrstat.error;phys.abundfloatnullable[Sr/Fe][-1.73/1.24]? Log Sr/Fe number abundance ratiophys.abundfloatnullablee_[Sr/Fe][0.1/0.5]? Uncertainty in [Sr/Fe]stat.error;phys.abundfloatnullable[Ba/Fe][-1.6/1.52]? Log Ba/Fe number abundance ratiophys.abundfloatnullablee_[Ba/Fe][0.1/0.3]? Uncertainty in [Ba/Fe]stat.error;phys.abundfloatnullablel_[Eu/Fe]Limit flag on [Eu/Fe]meta.code.error;phys.abundchar[Eu/Fe][-0.04/1.8]? Log Eu/Fe number abundance ratiophys.abundfloatnullablee_[Eu/Fe][0.2/0.3]? Uncertainty in [Eu/Fe]stat.error;phys.abundfloatnullable[Mg/Fe][0.19/0.61]? Log Mg/Fe number abundance ratiophys.abundfloatnullablee_[Mg/Fe][0.01/0.2]? Uncertainty in [Mg/Fe] (1)stat.error;phys.abundfloatnullable[Ca/Fe][0.22/0.81]? Log Ca/Fe number abundance ratiophys.abundfloatnullablee_[Ca/Fe][0.01/0.25]? Uncertainty in [Ca/Fe] (1)stat.error;phys.abundfloatnullable[ScII/Fe][-0.2/0.5] Log ScII/Fe number abundance ratiophys.abundfloate_[ScII/Fe][0.01/0.35] Uncertainty in [ScII/Fe] (1)stat.error;phys.abundfloat[TiI/Fe][0.02/0.51] Log TiI/Fe number abundance ratiophys.abundfloate_[TiI/Fe][0.04/0.2] Uncertainty in [TiI/Fe] (1)stat.error;phys.abundfloat[TiII/Fe][0.12/0.6] Log TiII/Fe number abundance ratiophys.abundfloate_[TiII/Fe][0.05/0.2] Uncertainty in [TiII/Fe] (1)stat.error;phys.abundfloat[VI/Fe][-0.27/0.5]? Log VI/Fe number abundance ratiophys.abundfloatnullablee_[VI/Fe][0.1/0.1]? Uncertainty in [VI/Fe] (1)stat.error;phys.abundfloatnullable[CrI/Fe][-0.4/0.08] Log CrI/Fe number abundance ratiophys.abundfloate_[CrI/Fe][0.02/0.21] Uncertainty in [CrI/Fe] (1)stat.error;phys.abundfloat[CrII/Fe][-0.2/0.33]? Log CrII/Fe number abundance ratiophys.abundfloatnullablee_[CrII/Fe][0.01/0.1]? Uncertainty in [CrII/Fe] (1)stat.error;phys.abundfloatnullable[Mn/Fe][-0.6/0.2]? Log Mn/Fe number abundance ratiophys.abundfloatnullablee_[Mn/Fe][0.01/0.32]? Uncertainty in [Mn/Fe] (1)stat.error;phys.abundfloatnullable[Co/Fe][-0.12/0.8]? Log Co/Fe number abundance ratiophys.abundfloatnullablee_[Co/Fe][0.01/0.22]? Uncertainty in [Co/Fe] (1)stat.error;phys.abundfloatnullable[Ni/Fe][-0.14/0.25] Log Ni/Fe number abundance ratiophys.abundfloate_[Ni/Fe][0.02/0.16] Uncertainty in [Ni/Fe] (1)stat.error;phys.abundfloat[Zn/Fe][-0.16/0.5]? Log Zn/Fe number abundance ratiophys.abundfloatnullablee_[Zn/Fe][0.01/0.13]? Uncertainty in [Zn/Fe] (1)stat.error;phys.abundfloatnullableDR5+6Display data from RAVE DR5 (III/279) and DR6 (III/283)meta.ref.urlintnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/ApJ/905/20/table3Stellar atmospheric parameters and abundances for previously observed starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAVEStellar identifier (JHHMMSS.s+DDMMSS)meta.id;meta.maincharONameOther identifiermeta.idcharRef[1/6] Literature Reference (1)meta.ref;pos.frameintTeff0[4701/6225] Effective temperature, literatureKphys.temperature.effectiveintlogg0[1.5/4.6] log surface gravity, literaturelog(cm.s**-2)phys.gravityfloat[Fe/H]0[-3.2/-1.5] metallicity, literaturephys.abund.Fefloatvt0[1.5/3] microturbulent velocity, literaturekm/sphys.velocfloatTeff[4711/6115] Effective temperature, this workKphys.temperature.effectiveintlogg[1.3/4] log surface gravity, this worklog(cm.s**-2)phys.gravityfloat[Fe/H][-2.92/-1.8] Metallicity, this workphys.abund.Fefloatvt[1.5/2.7] microturbulent velocity, this workkm/sphys.velocfloat[C/Fe]0[-0.4/1.51] Log C/Fe number abundance ratio, literature (2)phys.abundfloat[Sr/Fe]0[-0.33/0.9] Log Sr/Fe number abundance ratio, literature (2)phys.abundfloat[Ba/Fe]0[-1.36/1.17] Log Ba/Fe number abundance ratio, literature (2)phys.abundfloatl_[Eu/Fe]0Limit flag on [Eu/Fe]0meta.code.error;phys.abundchar[Eu/Fe]0[-0.21/1.63] Log Eu/Fe number abundance ratio, literature (2)phys.abundfloatl_[C/Fe]Limit flag on [C/Fe]meta.code.error;phys.abundchar[C/Fe][0/1.44] Log C/Fe number abundance ratio, this work (3)phys.abundfloat[Sr/Fe][-0.3/0.96]? Log Sr/Fe number abundance ratio, this workphys.abundfloatnullable[Ba/Fe][-1.23/1.2] Log Ba/Fe number abundance ratio, this workphys.abundfloat[Eu/Fe][0.18/1.8]? Log Eu/Fe number abundance ratio, this workphys.abundfloatnullableJ/ApJ/905/20/table8Line list for abundancesIonSpeciesphys.atmol.ionStagecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[3578.68/6297.792] Wavelength, Angstroms0.1nmem.wldoubleExPot[0.0/4.55] Excitation potentialeVphys.atmol.excitationfloatloggf[-5.7/0.65] log, statistical weight*oscillator strengthstat.weight;phys.atmol.oscStrengthfloat