J/A+A/548/A55ivo://CDS.VizieR/J/A+A/548/A55doi:10.26093/cds/vizier.35480055CDSAbia C.Palmerini S.Busso M.Cristallo S.2013-07-24T06:27:25Z2013-03-22T13:13:14ZCDS support team

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

cds-question@unistra.frgiant-starslate-type-starschemical-abundancesWe re-analyzed the carbon and oxygen isotopic ratios in the atmospheres of the two bright K giants Arcturus ({alpha} Boo) and Aldebaran ({alpha} Tau). These stars are in the evolutionary stage following the first dredge-up (FDU). Previous determinations (dating back more than 20 years) of their ^16^O/^18^O ratios showed a rough agreement with FDU expectations; however, the estimated ^16^O/^17^O and ^12^C/^13^C ratios were lower than in the canonical predictions for red giants. Today these anomalies are interpreted as signs of the occurrence of non-convective mixing episodes. We therefore re-investigated this problem to verify whether the observed data can be reproduced in this scenario and if the fairly well determined properties of the two stars can help us in fixing the uncertain parameters that characterize non-convective mixing and in constraining its physical nature.2012A&A...548A..55Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/548/A55CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/PASP/107/1042 : Infrared Arcturus Atlas (Hinkle+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/548/A55https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/548/A55http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/548/A55https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/548/A55https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/548/A55http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/548/A55GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/548/A55/table4CNO abundances, C and O isotopic ratios and equivalent diffusive coefficients for the observed and calculated extra-mixing models.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of star (Arcturus or Aldebaran), or FDU (First Dredge Up) for modelmeta.id;meta.maincharM? Mass used for the model (empty for observed)solMassphys.mass;instr.setupfloatnullableDelta? Mixing Depth {Delta} (1)stat.paramfloatnullabledM6? Mixing (circulation) ratesolMass/Myrstat.paramfloatnullableA(C)Carbon Abundance log{epsilon}(C)phys.abundfloate_A(C)? Error on A(C) (observed values only)stat.errorfloatnullableA(N)Nitrogen Abundance log{epsilon}(N)phys.abundfloatA(O)Oxygen Abundance log{epsilon}(O)phys.abundfloat12/13CCarbon Isotopic Ratio ^12^C/^13^Cphys.abundfloate_12/13C? Mean error on 12/13C (observed values only)stat.errorfloatnullable16/17OOxygen Isotopic Ratio ^16^O/^17^Ophys.abundinte_16/17O? Mean error on 16/17O (observed values only)stat.errorintnullable16/18OOxygen Isotopic Ratio ^16^O/^18^Ophys.abundinte_16/18O? Mean error on 16/18O (observed values only)stat.errorintnullable17/18OOxygen Isotopic Ratio ^17^O/^18^Ophys.abundfloate_17/18O? Mean error on 17/18O (observed values only)stat.errorfloatnullableD? Equivalent diffusive coefficientcm**2.s**-1stat.fit.paramdoublenullable