J/ApJ/844/18ivo://CDS.VizieR/J/ApJ/844/18doi:10.26093/cds/vizier.18440018CDSPlacco V.M.Holmbeck E.M.Frebel A.Beers T.C.Surman R.A.Ji A.P.,Ezzeddine R.Points S.D.Kaleida C.C.Hansen T.T.Sakari C.M.,Casey A.R.2018-05-16T07:04:37Z2018-04-03T10:21:10ZCDS support team

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

cds-question@unistra.frchemically-peculiar-starschemical-abundancesline-intensitiesWe report the discovery of RAVE J203843.2-002333, a bright (V=12.73), very metal-poor ([Fe/H]=-2.91), r-process-enhanced ([Eu/Fe]=+1.64 and [Ba/Eu]=-0.81) star selected from the RAVE survey. This star was identified as a metal-poor candidate based on its medium-resolution (R~1600) spectrum obtained with the KPNO/Mayall Telescope, and followed up with high-resolution (R~66000) spectroscopy with the Magellan/Clay Telescope, allowing for the determination of elemental abundances for 24 neutron-capture elements, including thorium and uranium. RAVE J2038-0023 is only the fourth metal-poor star with a clearly measured U abundance. The derived chemical abundance pattern exhibits good agreement with those of other known highly r-process- enhanced stars, and evidence suggests that it is not an actinide-boost star. Age estimates were calculated using U/X abundance ratios, yielding a mean age of 13.0+/-1.1Gyr.2017ApJ...844...18Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/844/18CatalogResearchIsServedByTAP VizieR generic servicerelated-toIII/279 : RAVE 5th data release (Kunder+, 2017)J/AJ/90/2089 : Stars of very low metal abundance. I (Beers+, 1985)J/AJ/103/1987 : Stars of very low metal abundance (Beers+ 1992)J/A+A/416/1117 : Abundances in the early Galaxy (Cayrel+, 2004)J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)J/AJ/136/2050 : SEGUE stellar parameter pipeline. II. (Lee+, 2008)J/AN/331/474 : Abundances of metal-poor stars (Frebel, 2010)J/A+A/516/A46 : HE 2327-5642 abundance analysis (Mashonkina+, 2010)J/ApJ/711/573 : Detailed abundances in a halo stellar stream (Roederer+, 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/794/58 : Metal-poor stars in the thick disk of the MW (Beers+, 2014)J/ApJ/781/40 : Metal-poor stars from HES survey. II. (Placco+, 2014)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/812/109 : HST & Keck spectroscopy of bright CEMP-s stars (Placco+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/844/18https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/844/18http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/844/18https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/844/18https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/844/18http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/844/18GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/844/18/table3Equivalent-width measurements for RAVE J2038-0023recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonIon or molecule identifierphys.atmol.ionStagecharlambda[3500.8/6979] Wavelength in Angstroms0.1nmem.wldoublechi[0.0/4.5] Excitation potentialeVphys.atmol.excitationfloatlog(gf)[-5.7/0.7] Log oscillator strengthphys.atmol.oscStrengthfloatEW[3/209] Equivalent Width in Angstroms0.1nmspect.line.eqWidthfloatlogeps(x)[0/5.3] Log number abundance of Ionlog(Sun)phys.abundfloatJ/ApJ/844/18/table4Individual abundance measurements of neutron-capture elements for RAVE J2038-0023recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonIon or molecule identifierphys.atmol.ionStagecharlambda[3472.4/6645.1] Wavelength in Angstroms0.1nmem.wldoublechi[0/3] Excitation potentialeVphys.atmol.excitationfloatlog(gf)[-1.6/1.5] Log oscillator strengthphys.atmol.oscStrengthfloatlogeps(x)[-2.2/0.6] Log number abundance of Ionlog(Sun)phys.abundfloatJ/ApJ/844/18/table5Final abundance estimates for RAVE J2038-0023recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonIon or molecule identifierphys.atmol.ionStagecharlogepsSun[-0.6/8.5] Log number abundance of Ion (log{epsilon}_{sun}_(X))log(Sun)phys.abundfloatlogeps(x)[-2.2/5.8] Log number abundance of Ion (log{epsilon}(X))log(Sun)phys.abundfloat[X/H][-3.5/-1.2] Average abundancelog(Sun)phys.abund;stat.meanfloat[X/Fe]Elemental abundance ratiolog(Sun)phys.abund;arith.ratiofloatf_[X/Fe]Flag on [C/Fe] (1)meta.codecharsigma[0.01/0.2] Standard deviationlog(Sun)stat.stdevfloatoverSig[0.1/0.2] Standard error of the mean (2)log(Sun)stat.errorfloatN[1/202] Number of line usedmeta.numberintJ/ApJ/844/18/figure1Selected regions of the spectrum of RAVE J2038-0023, compared with the r-II stars HE 1523-0901 and CS 22892-052recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStellar identifier (CS22892-052, HE1523-0901 or "RAVEJ2038")meta.id;meta.maincharPanel[A-E] Figure 1 panel spectrum shown inmeta.bib.figcharlambda[4065/5190] Wavelength in Angstroms0.1nmem.wldoubleNFlux[0.1/1.4] Normalized fluxphot.flux;arith.ratiofloat