J/A+A/548/A42ivo://CDS.VizieR/J/A+A/548/A42doi:10.26093/cds/vizier.35480042CDSSiqueira Mello C.Jr.Barbuy B.Spite M.Spite F.2017-06-21T08:22:10Z2012-11-19T07:48:43ZCDS support team

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

cds-question@unistra.frvariable-starschemical-abundancesHD 140283 is a nearby (V=7.7) subgiant metal-poor star, extensively analysed in the literature. Although many spectra have been obtained for this star, none showed a signal-to-noise (S/N) ratio high enough to enable a very accurate derivation of abundances from weak lines. The detection of europium proves that the neutron-capture elements in this star are originate in the r-process, and not in the s-process, as recently claimed in the literature. Based on the OSMARCS 1D LTE atmospheric model and with a consistent approach based on the spectrum synthesis code Turbospectrum, we measured the europium lines 4129{AA} and 4205{AA}, taking into account the hyperfine structure of the transitions. The spectrum, obtained with a long exposure time of seven hours at the Canada-France-Hawaii Telescope (CFHT), has a resolving power of 81000 and a S/N ratio of 800 at 4100{AA}. We were able to determine the abundance A(Eu)=-2.35dex, compatible with the value predicted for the europium from the r-process. The abundance ratio [Eu/Ba]=+0.58dex agrees with the trend observed in metal-poor stars and is also compatible with a strong r-process contribution to the origin of the neutron-capture elements in HD 140283.2012A&A...548A..42Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/548/A42CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/548/A42https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/548/A42http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/548/A42https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/548/A42https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/548/A42http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/548/A42GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/548/A42/table*List of iron lines used in this workrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonSpecie of iron line (FeI or FeII)phys.atmol.ionStagecharlambda[3700/10400] Wavelength of the line ({AA})0.1nmem.wl;spect.linedoubleExcPotExcitation potentialeVphys.atmol.excitationfloatloggfOscillator strength of the transitionphys.atmol.wOscStrength;phys.atmol.transitionfloatEWGEquivalent width measured by Gallagher et al. (2010A&A...523A..24G)0.1pmspect.line.eqWidthfloatEWEquivalent width measured in this work0.1pmspect.line.eqWidthfloatA(Fe)Iron abundance (1)phys.abund.Fefloat[Fe/H]Abundance ratio (2)log(Sun)phys.abund;arith.ratiofloat