J/ApJ/742/54ivo://CDS.VizieR/J/ApJ/742/54doi:10.26093/cds/vizier.17420054CDSHollek J.K.Frebel A.Roederer I.U.Sneden C.Shetrone M.Beers T.C.,Kang S.-J.Thom C.2017-09-20T05:13:59Z2013-06-03T20:12:21ZCDS support team

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

cds-question@unistra.frline-intensitieschemical-abundanceshalo-starschemically-peculiar-starsWe present a comprehensive abundance analysis of 20 elements for 16 new low-metallicity stars from the Chemical Abundances of Stars in the Halo (CASH) project. The abundances have been derived from both Hobby-Eberly Telescope High Resolution Spectrograph snapshot spectra (R~15000) and corresponding high-resolution (R~35000) Magellan Inamori Kyocera Echelle spectra. The stars span a metallicity range from [Fe/H] from -2.9 to -3.9, including four new stars with [Fe/H]<-3.7. We find four stars to be carbon-enhanced metal-poor (CEMP) stars, confirming the trend of increasing [C/Fe] abundance ratios with decreasing metallicity. Two of these objects can be classified as CEMP-no stars, adding to the growing number of these objects at [Fe/H]<-3. We also find four neutron-capture-enhanced stars in the sample, one of which has [Eu/Fe] of 0.8 with clear r-process signatures. These pilot sample stars are the most metal-poor ([Fe/H]<~-3.0) of the brightest stars included in CASH and are used to calibrate a newly developed, automated stellar parameter and abundance determination pipeline. This code will be used for the entire ~500 star CASH snapshot sample. We find that the pipeline results are statistically identical for snapshot spectra when compared to a traditional, manual analysis from a high-resolution spectrum.2011ApJ...742...54Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/742/54CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/412/843 : SAGA extremely metal-poor stars (Suda+, 2011)J/A+A/530/A15 : Abundances of 94 stars (Nissen+, 2011)J/ApJ/711/573 : Detailed abundances in a halo stellar stream (Roederer+, 2010)J/A+A/501/519 : Extremely metal-poor stars abundances (Bonifacio+, 2009)J/ApJ/706/1095 : Chemical compositions of 26 outer halo stars (Zhang+, 2009)J/A+A/490/769 : Yields from extremely metal-poor stars (Campbell+, 2008)J/ApJ/679/1549 : Spectroscopy of CS 17435-00532. Paper I. (Roederer+, 2008)J/ApJ/655/492 : Equivalent widths of 26 metal-poor stars (Aoki+, 2007)J/AJ/132/137 : Abundances of extremely metal-poor carbon stars (Cohen+, 2006)J/ApJ/652/1585 : Bright metal-poor stars from HES survey (Frebel+, 2006)J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)J/AJ/130/2804 : Carbon abundances in metal-poor stars (Rossi+, 2005)J/A+A/415/993 : FeII, ZNI and SI abundances on halo stars (Nissen+, 2004)J/A+A/425/671 : Equivalent widths of 10 metal-poor halo stars (Bai+, 2004)J/AJ/128/2402 : Extremely metal-poor star candidates abundances (Lai+, 2004)J/ApJS/155/651 : Evolution of extremely metal-poor stars (Herwig+, 2004)J/A+A/416/1117 : Abundances in the early Galaxy (Cayrel+, 2004)J/A+A/403/1105 : Extremely metal-poor giants EWs (Francois+, 2003)J/A+AS/141/491 : Chemical composition of halo and disk stars (Nissen+, 2000)J/AJ/120/1841 : Abundances & Kinematics of Halo & Disk Stars (Fulbright 2000)J/A+A/354/169 : Metal-poor field stars abundances (Gratton+, 2000)J/AJ/90/2089 : Stars of very low metal abundance. I (Beers+, 1985)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/742/54https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/742/54http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/742/54https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/742/54https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/742/54http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/742/54GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/742/54/table5 (Stellar parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/742/54/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/742/54/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/742/54/table5?GETtext/xml+votable180.050000true4.017625-2.68480560.005555555555555556Cone search capability for table J/ApJ/742/54/table1 (Observations (21 stars))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/742/54/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/742/54/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/742/54/table1?GETtext/xml+votable180.050000true4.0175-2.6850.0055555555555555566/17040 17364 18056 18098 18545 18850 19000 19073 22632 23220 23304 25836 26183 26457 26886 35532 35889 45694 45796 48631 48798https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/742/54?format=asciiOpticaldefaultJ/ApJ/742/54/table5Stellar parametersSimbadNameSimbad column added by the CDSmeta.idcharTeff2? Effective temperature from HET/HRSKphys.temperature.effectiveintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar name (G1)meta.id;meta.maincharprimaryTeffEffective temperature from Magellan/MIKEKphys.temperatureintloggSurface gravity from Magellan/MIKElog(cm.s**-2)phys.gravityfloatVtMicroturbulent velocity from Magellan/MIKEkm/sphys.velocfloat[Fe/H]Metallicity from Magellan/MIKElog(Sun)phys.abund.Fefloatlogg2? Surface gravity from HET/HRSlog(cm.s**-2)phys.gravityfloatnullableVt2? Microturbulent velocity from HET/HRSkm/sphys.velocfloatnullable[Fe/H]2? Metallicity from HET/HRSlog(Sun)phys.abund.Zfloatnullablef_[Fe/H]2[a] a = sky contamination in this spectrummeta.codecharAbAbundances for this starmeta.ref.urlcharEWEquivalent widths for this starmeta.ref.urlcharObsObservations of this starmeta.ref.urlcharHESLink to Hamburg/ESO metal-poor sample (Cat. J/ApJ/652/1585)meta.ref.urlchar_RAPosition (from Simbad) (right ascension part)degpos.eq.ra;meta.main_DEPosition (from Simbad) (declination part)degpos.eq.dec;meta.mainJ/ApJ/742/54/table1Observations (21 stars)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar identification (G1)(1)meta.id;meta.maincharTelTelescope (HET or Magellan)meta.id;instr.telcharDateUT date of observationtime.epoch;obsnullablef_Date[d] d = contaminated (2)meta.codecharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainExp? Exposure timestime.duration;obs.exposureintnullableS/N? Signal to noise ratio at 5180{AA}stat.snrintnullablef_S/N[a] a = S/N for combined HET spectrameta.codecharRV? Radial velocity (3)km/sphys.veloc;pos.heliocentricfloatnullableSimbadSimbad column added by the CDSmeta.refcharJ/ApJ/742/54/table2Equivalent widths (21 stars)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar name (G1)meta.id;meta.maincharIonIon identification (1)phys.atmol.ionStagefloatlambdaWavelength {lambda} ({AA})0.1nmem.wlfloatExPotExcitation potentialeVphys.atmol.excitationfloatlog(gf)Log of the oscillator strengthphys.atmol.oscStrengthfloatEWEquivalent width (m{AA})0.1pmspect.line.eqWidthfloatJ/ApJ/742/54/table6AbundancesSc2log{epsilon}(ScII)(MIKE)phys.abundfloato_Zn1Number of ZnI lines used in abundancemeta.numberintl_Zn1Limit flag on Zn1phys.abundcharo_La2Number of LaII lines used in abundancemeta.numberintl_Eu2Limit flag on Eu2phys.abundcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar name (G1)meta.id;meta.mainchar[Fe/H]Abundance of [Fe/H](MIKE)log(Sun)phys.abundfloatl_Li1Limit flag on Li1phys.abundcharLi1log{epsilon}(LiI)(MIKE)phys.abundfloate_Li1Uncertainty in Li1stat.errorfloatClog{epsilon}(C)(MIKE)phys.abundfloate_CUncertainty in Cstat.errorfloat[C/Fe]Abundance of [C/Fe](MIKE)log(Sun)phys.abundfloatMg1log{epsilon}(MgI)(MIKE)phys.abundfloate_Mg1Uncertainty in Mg1stat.errorfloat[Mg/Fe]Abundance of [Mg/Fe](MIKE)log(Sun)phys.abundfloato_Mg1Number of MgI lines used in abundancemeta.numberintAl1? log{epsilon}(AlI)(MIKE)phys.abundfloatnullablee_Al1? Uncertainty in Al1stat.errorfloatnullable[Al/Fe]? Abundance of [Al/Fe](MIKE)log(Sun)phys.abundfloatnullableo_Al1? Number of AlI lines used in abundancemeta.numberintnullableSi1? log{epsilon}(SiI)(MIKE)phys.abundfloatnullablee_Si1? Uncertainty in Si1stat.errorfloatnullable[Si/Fe]? Abundance of [Si/Fe](MIKE)log(Sun)phys.abundfloatnullableo_Si1Number of SiI lines used in abundancemeta.numberintCa1log{epsilon}(CaI)(MIKE)phys.abundfloate_Ca1Uncertainty in Ca1stat.errorfloat[Ca/Fe]Abundance of [Ca/Fe](MIKE)log(Sun)phys.abundfloato_Ca1Number of CaI lines used in abundancemeta.numberinte_Sc2Uncertainty in Sc2stat.errorfloat[Sc/Fe]Abundance of [Sc/Fe](MIKE)log(Sun)phys.abundfloato_Sc2Number of ScII lines used in abundancemeta.numberintTi1log{epsilon}(TiI)(MIKE)phys.abundfloate_Ti1Uncertainty in Ti1stat.errorfloat[Ti1/Fe]Abundance of [Ti1/Fe](MIKE)log(Sun)phys.abundfloato_Ti1Number of TiI lines used in abundancemeta.numberintTi2log{epsilon}(TiII)(MIKE)phys.abundfloate_Ti2Uncertainty in Ti2stat.errorfloat[Ti2/Fe]Abundance of [Ti2/Fe](MIKE)log(Sun)phys.abundfloato_Ti2Number of TiII lines used in abundancemeta.numberintCr1? log{epsilon}(CrI)(MIKE)phys.abundfloatnullablee_Cr1? Uncertainty in Cr1stat.errorfloatnullable[Cr1/Fe]? Abundance of [Cr1/Fe](MIKE)log(Sun)phys.abundfloatnullableo_Cr1? Number of CrI lines used in abundancemeta.numberintnullableCr2? log{epsilon}(CrII)_MIEKphys.abundfloatnullablee_Cr2? Uncertainty in Cr2stat.errorfloatnullable[Cr2/Fe]? Abundance of [Cr2/Fe](MIKE)log(Sun)phys.abundfloatnullableo_Cr2Number of CrII lines used in abundancemeta.numberintMn1? log{epsilon}(MnI)(MIKE)phys.abundfloatnullablee_Mn1? Uncertainty in Mn1stat.errorfloatnullable[Mn/Fe]? Abundance of [Mn/Fe](MIKE)log(Sun)phys.abundfloatnullableo_Mn1? Number of MnI lines used in abundancemeta.numberintnullableCo1log{epsilon}(CoI)(MIKE)phys.abundfloate_Co1Uncertainty in Co1stat.errorfloat[Co/Fe]Abundance of [Co/Fe](MIKE)log(Sun)phys.abundfloato_Co1Number of CoI lines used in abundancemeta.numberintNi1log{epsilon}(NiI)(MIKE)phys.abundfloate_Ni1Uncertainty in Ni1stat.errorfloat[Ni/Fe]Abundance of [Ni/Fe](MIKE)log(Sun)phys.abundfloato_Ni1Number of NiI lines used in abundancemeta.numberintZn1log{epsilon}(ZnI)(MIKE)phys.abundfloatl_e_Zn1Limit flag on eZn1phys.abundchare_Zn1Uncertainty in Zn1stat.errorfloat[Zn/Fe]Abundance of [Zn/Fe](MIKE)log(Sun)phys.abundfloatSr2log{epsilon}(SrII)(MIKE)phys.abundfloate_Sr2Uncertainty in Sr2stat.errorfloat[Sr/Fe]Abundance of [Sr/Fe](MIKE)log(Sun)phys.abundfloato_Sr2Number of SrII lines used in abundancemeta.numberintl_Y2Limit flag on Y2phys.abundcharY2log{epsilon}(Y.II)(MIKE)phys.abundfloatl_eY2Limit flag on eY2phys.abundchareY2Uncertainty in Y2stat.errorfloat[Y/Fe]Abundance of [Y/Fe](MIKE)log(Sun)phys.abundfloato_Y2Number of Y.II lines used in abundancemeta.numberintl_Zr2Limit flag on Zr2phys.abundcharZr2log{epsilon}(ZrII)(MIKE)phys.abundfloate_Zr2Uncertainty in Zr2stat.errorfloatl_[Zr/Fe]Limit flag on [Zr2/Fe]phys.abundchar[Zr/Fe]Abundance of [Zr/Fe](MIKE)log(Sun)phys.abundfloato_Zr2Number of ZrII lines used in abundancemeta.numberintBa2log{epsilon}(BaII)(MIKE)phys.abundfloat[Ba2/Fe]Abundance of [Ba/Fe](MIKE)phys.abundfloate_Ba2Uncertainty in Ba2log(Sun)stat.errorfloato_Ba2Number of BaII lines used in abundancemeta.numberintl_La2Limit flag on La2phys.abundcharLa2log{epsilon}(LaII)(MIKE)phys.abundfloate_La2Uncertainty in La2stat.errorfloatl_[La/Fe]Limit flag on [La/Fe]phys.abundchar[La/Fe]Abundance of [La/Fe](MIKE)log(Sun)phys.abundfloatEu2log{epsilon}(EuII)(MIKE)phys.abundfloate_Eu2Uncertainty in Eu2stat.errorfloatl_[Eu/Fe]Limit flag on [Eu/Fe]phys.abundchar[Eu/Fe]Abundance of [Eu/Fe](MIKE)log(Sun)phys.abundfloato_Eu2Number of EuII lines used in abundancemeta.numberint[Fe/H]H? Abundance of [Fe/H](HRS)log(Sun)phys.abundfloatnullable[Cg/Fe]H? Abundance of [Cg/Fe](HRS)log(Sun)phys.abundfloatnullable[Mg/Fe]H? Abundance of [Mg/Fe](HRS)log(Sun)phys.abundfloatnullable[Ca/Fe]H? Abundance of [Ca/Fe](HRS)log(Sun)phys.abundfloatnullable[Sc/Fe]H? Abundance of [Sc/Fe](HRS)log(Sun)phys.abundfloatnullable[Ti/Fe]H? Abundance of [Ti/Fe](HRS)log(Sun)phys.abundfloatnullable[Cr/Fe]H? Abundance of [Cr/Fe](HRS)log(Sun)phys.abundfloatnullable[Mn/Fe]H? Abundance of [Mn/Fe](HRS)log(Sun)phys.abundfloatnullable[Zn/Fe]H? Abundance of [Zn/Fe](HRS)log(Sun)phys.abundfloatnullable[Sr/Fe]H? Abundance of [Sr/Fe](HRS)log(Sun)phys.abundfloatnullable[Y/Fe]H? Abundance of [Y/Fe](HRS)log(Sun)phys.abundfloatnullable[Ba/Fe]H? Abundance of [Ba/Fe](HRS)log(Sun)phys.abundfloatnullable