J/AZh/84/997ivo://CDS.VizieR/J/AZh/84/997CDSMashonkina L.I.Vinogradova A.B.Ptitsyn D.A.Khokhlova V.S.,Chernetsova T.A.2017-06-29T08:55:48Z2008-06-29T15:22:10ZCDS support team

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

cds-question@unistra.frsupergiant-starsvisible-astronomyWide-band photometrySr, Y, Zr, and Ce abundances are derived for the sample of 74 cool dwarfs and subgiants with the iron abundance [Fe/H] ranged between -2.43 and 0.25. The results are based on LTE (Y, Zr and Ce) and non-LTE (Sr) line formation and line profile analysis of high resolution (40000 and 60000) spectra that have a typical S/N of 50-200. The Zr/Y, Sr/Y, and Sr/Zr ratios in the halo stars form nearly a plateau over the wide metallicity range, -2.43<=[Fe/H]<=0.90, indicating a common origin of Sr, Y, and Zr at the epoch of the halo formation. We find a steep decline of [Zr/Y] in the thick disk stars with increasing Ba abundance. This suggests the reduction of the production rate of Zr compared to that for Y at the active phase of the thick disk formation. The halo and thick disk stars reveal an overabundance of Zr relative to barium that grows with decreasing Ba abundance. There is a clear correlation of the [Zr/Ba] and [Eu/Ba] abundance ratios. Our observational findings for the halo and thick disk do not support the Galaxy chemical evolution models available in the literature and require to improve their predictions. The thin disk stars reveal, on average, solar abundance ratios for (Y,Zr)/Fe, (Y,Zr)/Ba, and Zr/Y. We note a slight decline of Zr/Ba and Zr/Y in these stars with increasing Ba abundance. Our results favour a dominance of the asymptotic giant branch stars in the heavy element enrichment of the interstellar gas over the epoch of the thin disk existence, in agreement with the theory of the main s-process nucleosynthesis.2007AZh....84..997Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AZh/84/997CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AZh/84/997https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AZh/84/997http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AZh/84/997https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AZh/84/997https://vizier.iucaa.in/viz-bin/votable?-source=J/AZh/84/997http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AZh/84/997GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AZh/84/997/abun (Stellar parameters and element abundance ratios of the stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AZh/84/997/abun?https://vizier.iucaa.in/viz-bin/conesearch/J/AZh/84/997/abun?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AZh/84/997/abun?GETtext/xml+votable180.050000true2.170575836.6271250.0055555555555555566/679 798 1808 3020 3313 3494 3780 4376 4808 5587 5929 6226 6308 6409 6539 6926 6941 8746 9476 9801 9835 10375 10899 11412 12451 12644 12704 12899 13474 14204 14502 14534 15030 15154 15174 15597 16679 19179 20402 20446 21809 21866 21901 22205 22300 22594 23096 23974 24178 25554 25766 25939 25966 26575 27975 28664 30529 30576 30579 31094 31503 32335 33131 34684 36527 37232 38072 38216 39692 43445 44243 44542 48736https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AZh/84/997?format=asciiOpticaldefaultJ/AZh/84/997/table1Atomic data and solar abundances for investigated lines obtained from solar line profile fittingrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonSpeciesphys.atmol.ionStagecharlambdaWavelength0.1nmem.wlfloatEexcExcitation energy (1)eVphys.atmol.excitationfloatMultMultiplicity numberphys.atmol.levelintloggflog of oscillation strengthphys.atmol.collStrengthfloatRefReference (2)meta.ref;pos.frameintn_logC6[1-3] Origin of logC6 (3)meta.notecharlog(eps)Solar abundance (H=12)phys.abundfloatRemRemarksmeta.notecharlogC6C_6_ abundancephys.abundfloatJ/AZh/84/997/abunStellar parameters and element abundance ratios of the starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHD/BDHD numbermeta.id;meta.maincharTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravityphys.gravityfloat[Fe/H]Iron abundancephys.abund.FefloatVTMicroturbulence velocitykm/sphys.veloc.microTurbfloatCode[0/3] Stellar population type (1)meta.noteint[Sr/Fe]? Strontium to Fe abundancephys.abundfloatnullable[Y/Fe]? Yttrium to Fe abundancephys.abund.Fefloatnullable[Zr/Fe]? Zirconium to Fe abundancephys.abundfloatnullable[Ba/Fe]Barium to Fe abundancephys.abund.Fefloat[Ce/Fe]? Cerium to Fe abundancephys.abundfloatnullableSimbadSimbad column added by the CDSchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main