J/ApJ/864/43ivo://CDS.VizieR/J/ApJ/864/43doi:10.26093/cds/vizier.18640043CDSCain M.Frebel A.Gull M.Ji A.P.Placco V.M.Beers T.C.Melendez J.,Ezzeddine R.Casey A.R.Hansen T.T.Roederer I.U.Sakari C.2020-04-30T07:23:48Z2019-09-20T14:03:42ZCDS support team

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

cds-question@unistra.frvisible-astronomyspectroscopychemical-abundancesgiant-starshalo-starsline-intensitiesWe present detailed chemical abundances of three new bright (V~11), extremely metal-poor ([Fe/H]~-3.0), r-process-enhanced halo red giants based on high-resolution, high-S/N Magellan/MIKE spectra. We measured abundances for 20-25 neutron-capture elements in each of our stars. J1432-4125 is among the most r-process-rich r-II stars, with [Eu/Fe]=+1.44+/-0.11. J2005-3057 is an r-I star with [Eu/Fe]=+0.94+/-0.07. J0858-0809 has [Eu/Fe]=+0.23+/-0.05 and exhibits a carbon abundance corrected for an evolutionary status of [C/Fe]_corr_=+0.76, thus adding to the small number of known carbon-enhanced r-process stars. All three stars show remarkable agreement with the scaled solar r-process pattern for elements above Ba, consistent with enrichment of the birth gas cloud by a neutron star merger. The abundances for Sr, Y, and Zr, however, deviate from the scaled solar pattern. This indicates that more than one distinct r-process site might be responsible for the observed neutron-capture element abundance pattern. Thorium was detected in J1432-4125 and J2005-3057. Age estimates for J1432-4125 and J2005-3057 were adopted from one of two sets of initial production ratios each by assuming the stars are old. This yielded individual ages of 12+/-6Gyr and 10+/-6Gyr, respectively.2018ApJ...864...43Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/864/43CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)III/279 : RAVE 5th data release (Kunder+, 2017)J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)J/ApJ/655/492 : Equivalent widths of 26 metal-poor stars (Aoki+, 2007)J/ApJS/182/80 : Rare earth abundances (Sneden+, 2009)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/762/26 : Most metal-poor stars. II. Galactic halo stars (Yong+, 2013)J/ApJ/794/58 : Metal-poor stars in the Galaxy thick disk (Beers+, 2014)J/ApJS/215/23 : FeI branching fractions (Den Hartog+, 2014)J/A+A/571/A47 : Linelist of CH in stellar atmospheres (Masseron+, 2014)J/ApJ/797/21 : Carbon-enhanced metal-poor stars (Placco+, 2014)J/MNRAS/441/3127 : FeI oscillator strengths for Gaia-ESO (Ruffoni+, 2014)J/ApJS/214/26 : Line lists for CN isotopes transitions (Sneden+, 2014)J/ApJ/830/93 : Ret II brightest red giant member abundances (Ji+, 2016)J/ApJ/817/53 : Fe-group abundance analysis in HD84937 (Sneden+, 2016)J/ApJ/835/81 : Bright metal-poor stars from HES Survey. II. (Beers+, 2017)J/ApJ/847/142 : Ultra-metal-poor stars LTE & NLTE abund. (Ezzeddine+, 2017)J/ApJ/838/44 : Abundances of Tuc III brightest members (Hansen+, 2017)J/A+A/607/A91 : CS 29497-004 abundances (Hill+, 2017)J/ApJ/844/18 : RAVE J203843.2-002333 high-res. spectroscopy (Placco+, 2017)J/ApJ/838/11 : Member stars in the MW satellite Tucana III (Simon+, 2017)J/A+A/612/A90 : Inelastic Fe+H collision data (Barklem, 2018)J/ApJ/858/92 : RPA Southern Pilot Search of 107 Stars (Hansen+, 2018)J/AJ/155/256 : Spectroscopy of RAVE metal-poor stars (Placco+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/864/43https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/864/43http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/864/43https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/864/43https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/864/43http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/864/43GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/864/43/stars (Stellar parameters and observation details (Tables 1 and 2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/864/43/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/864/43/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/864/43/stars?GETtext/xml+votable180.050000true134.524167-8.1547220.0055555555555555566/40898 43367 47955https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/864/43?format=asciiOpticaldefaultJ/ApJ/864/43/table3Equivalent width and synthesis measurements for J0858-0809, J1432-4125, and J2005-3057recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonElement/Ion identifierphys.atmol.ionStagecharlambda[3329.4/8824.3] Wavelength; Angstrom0.1nmem.wlfloatExPot[0/4.5]? Excitation potentialeVphys.atmol.excitationfloatnullablelog(gf)[-9.9/0.8]? log oscillator strengthphys.atmol.oscStrengthfloatnullableEW1[1.8/219.4]? Equivalenth width of J0858-0809 (1)1e-13mspect.line.widthfloatnullablef_EW1[s] Flag on EW1 (2)meta.codecharl_loge1Limit flag on loge1meta.code.errorcharloge1[-3.1/6.5]? log absolute abundance of J0858-0809phys.abundfloatnullableEW2[3.5/208.3]? Equivalenth width of J1432-4125 (1)1e-13mspect.line.widthfloatnullablef_EW2[s] Flag on EW2 (2)meta.codecharl_loge2Limit flag on loge2meta.code.errorcharloge2[-1.7/5.7]? log absolute abundance of J1432-4125phys.abundfloatnullableEW3[2.6/250.7]? Equivalenth width of J2005-3057 (1)1e-13mspect.line.widthfloatnullablef_EW3[s] Flag on EW3 (2)meta.codecharl_loge3Limit flag on loge3meta.code.errorcharloge3[-2.2/6.6]? log absolute abundance of J2005-3057phys.abundfloatnullableJ/ApJ/864/43/starsStellar parameters and observation details (Tables 1 and 2)SimbadNameSimbad column added by the CDSmeta.idcharExp2? Exposure time of the second observationmintime.duration;obs.exposureintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharTeff1[4430/4900] LTE corrected effective temperatureKphys.temperature.effectiveintlogg1[0.6/1.7] LTE corrected surface gravitylog(cm.s**-2)phys.gravityfloatVt1[1.6/2.3] LTE corrected microturbulent velocitykm/sphys.veloc.microTurbfloat[Fe/H]1[-3.2/-2.9] LTE corrected [Fe/H]phys.abund.FefloatTeff2[4180/4705] LTE uncorrected effective temperatureKphys.temperature.effectiveintlogg2[0/1.2] LTE uncorrected surface gravitylog(cm.s**-2)phys.gravityfloatVt2[1.5/2.2] LTE uncorrected microturbulent velocitykm/sphys.veloc.microTurbfloat[Fe/H]2[-3.4/-3.1] LTE uncorrected [Fe/H]phys.abund.FefloatTeff3[4300/4850] NLTE effective temperatureKphys.temperature.effectiveintlogg3[0.9/1.9] NLTE surface gravitylog(cm.s**-2)phys.gravityfloatVt3[1.5/2.2] NLTE microturbulent velocitykm/sphys.veloc.microTurbfloat[Fe/H]3[-2.9/-2.8] NLTE [Fe/H]phys.abund.FefloatTeff4[4599/5334] Effective temperature from medium-resolution spectrumKphys.temperature.effectiveintlogg4[0.9/2.7] Surface gravity from medium-resolution spectrumlog(cm.s**-2)phys.gravityfloat[Fe/H]4[-3.1/-2.9] [Fe/H] from medium-resolution spectrumphys.abund.FefloatRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainObsObservation date (UT)stime.epoch;obsnullableSlitSlitarcsecinstr.setupfloatExpExposure timemintime.duration;obs.exposureintVmagV-band magnitudemagphot.mag;em.opt.VfloatB-VB-V color indexmagphot.color;em.opt.B;em.opt.VfloatSN4000Signal-to-noise ratio per pixel at 4000{AA} (1)stat.snr;instr.pixelintSN4500Signal-to-noise ratio per pixel at 4500{AA} (1)stat.snr;instr.pixelintSN6000Signal-to-noise ratio per pixel at 6000{AA} (1)stat.snr;instr.pixelintHRVHeliocentric velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatObs2Second date of observation (UT)stime.epoch;obsnullableHRV2? Second measure of heliocentric velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatnullableLink1Display the equivalent widths for this star (link to Table 3)meta.ref.urlchar