J/A+A/607/A91ivo://CDS.VizieR/J/A+A/607/A91doi:10.26093/cds/vizier.36070091CDSHill V.Christlieb N.Beers T.C.Barklem P.S.Kratz K.-L.,Nordstrom B.Pfeiffer B.Farouqi K.2017-12-13T18:22:49Z2017-11-21T07:45:10ZCDS support team

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

cds-question@unistra.frgiant-starsspectroscopychemical-abundancesline-intensitiesWe report an abundance analysis for the highly r-process-enhanced (r-II) star CS 29497-004, a very metal-poor giant with solar system Teff=5013K and [Fe/H]=-2.85, whose nature was initially discovered in the course of the HERES project. Our analysis is based on high signal-to-noise ratio, high-resolution (R~75000) VLT/UVES spectra and MARCS model atmospheres under the assumption of local thermodynamic equilibrium, and obtains abundance measurements for a total of 46 elements, 31 of which are neutron-capture elements. As is the case for the other ~25 r-II stars currently known, the heavy-element abundance pattern of CS 29497-004 well-matches a scaled solar system second peak r-process-element abundance pattern. We confirm our previous detection of Th, and demonstrate that this star does not exhibit an "actinide boost". Uranium is also detected (log{epsilon}(U)=-2.20+/-0.30), albeit with a large measurement error that hampers its use as a precision cosmochronometer. Combining the various elemental chronometer pairs that are available for this star, we derive a mean age of 12.2+/-3.7Gyr using the theoretical production ratios from published waiting-point approximation models. We further explore the high-entropy wind model (Farouqi et al., 2010ApJ...712.1359F) production ratios arising from different neutron richness of the ejecta (Ye), and derive an age of 13.7+/-4.4Gyr for a best-fitting Ye=0.447. The U/Th nuclei-chronometer is confirmed to be the most resilient to theoretical production ratios and yields an age of 16.5+/-6.6Gyr. Lead (Pb) is also tentatively detected in CS 29497-004, at a level compatible with a scaled solar r-process, or with the theoretical expectations for a pure r-process in this star.2017A&A...607A..91Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/607/A91CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)J/A+A/516/A46 : HERES V. HE 2327-5642 abundance analysis (Mashonkina+, 2010)J/A+A/528/A92 : HERES VI. Galactic chemical evolution of Si & C (Zhang+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/607/A91https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/607/A91http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/607/A91https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/607/A91https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/607/A91http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/607/A91GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/607/A91/tableb1Neutron-capture elements linelist and individual abundances in CS 29497-004recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSpeciesSpeciesmeta.notecharlambdaWavelength0.1nmem.wldoubleEPEnergy potentialeVphys.energy;phys.atmol.levelfloatloggfOscillator strengthphys.atmol.oscStrengthfloatr_loggfReference for loggf (1)meta.ref;pos.frameintr_HFS? Reference for hyperfine splitting parameters used (2)meta.ref;pos.frameintnullableEW? Equivalent width0.1pmspect.line.eqWidthfloatnullablen_EW[syn] syn for syntheticmeta.notecharEWsyn? Synthetic equivalent width0.1nmspect.line.eqWidthfloatnullablelogepsAbundancephys.abundfloat