J/A+A/705/A38ivo://CDS.VizieR/J/A+A/705/A38CDSMishenina T.Kurtukian-Nieto T.Gorbaneva T.Amarsi A.M.Psaltis A.,Pignatari M.2026-03-02T06:25:50Z2026-01-07T07:36:11ZCDS support team

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

cds-question@unistra.frlate-type-starschemical-abundancesvisible-astronomyThe stellar origin of the elements Molybdenum (Mo, Z=42) and Ruthenium (Ru, Z=44) is still a matter of debate. Studying their abundances provides valuable insights into the nucleosynthesis processes and the broader evolution of neutron-capture elements. The aim of this work is to present new observations of Mo and Ru, together with nearby neutron-capture element Sr and Zr for a new sample of 154 giant stars, located in the Galactic disk with metallicity -1<[Fe/H]<+0.3. The abundances are determined applying the Local Thermodynamic Equilibrium by fitting synthetic spectra. The abundances of Mo were derived from the MoI lines at 5506 and 5533{AA}, while the abundances of Ru were determined from RuI lines at 4584, and 4757{AA}. The abundances of strontium (Sr) and zirconium (Zr) measured using lines of SrII at 4077 and 4215{AA} and of ZrI at 5385, 6127, and 613{AA}. We derive Sr, Zr, and Mo abundances for all stars in our sample, and Ru for 110 stars. For most of the giant stars observed in this work, the Mo and Ru abundances were determined for the first time. We compare our observations with the signature from different nucleosynthesis processes. Both the [Mo/Fe] and [Ru/Fe] in our stars show a decreasing trend with respect to the increasing [Fe/H]. This pattern is similar to [Zr/Fe], whereas [Sr/Fe] shows a rather at trend with respect to metallicity. These results are compatible with our previous measurements obtained for dwarf stars over the same metallicity range. Compared to the s-process ratios, all stars show a lower [Zr/Mo] and a higher [Ru/Mo], as expected from classical nucleosynthesis. Instead, it is unclear if additional contributions from neutrino-wind components or the i-process are needed to explain the observed scatter of [Zr/Mo] and [Ru/Mo] in the Milky Way disk. Indeed, such a dispersion is compatible with the variation also seen in r-II stars at low metallicity, and therefore it could just be a product of the combination of r-process and s-process contributions to Galactic Chemical Evolution. The observed [Zr/Mo] and [Ru/Mo] scatter in r-II stars should be constrained by future investigations to define if any contributions of additional nucleosynthesis components are needed.2026A&A...705A..38Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/705/A38CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/705/A38https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/705/A38http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/705/A38https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/705/A38https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/705/A38http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/705/A38GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/705/A38/tablea1 (Stellar parameters and abundances of Sr, Zr, Mo, Ru)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/705/A38/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/705/A38/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/705/A38/tablea1?GETtext/xml+votable180.050000true8.147853320.29431780.0055555555555555566/140 166 210 327 341 428 915 1249 1819 1960 1998 2014 2229 2324 2440 2541 2921 3026 3094 3335 3418 3619 3755 4051 4794 4969 4985 5059 5245 5286 5589 5789 5815 5950 5983 6120 6166 6203 6251 6334 6361 6493 6827 6933 7006 7039 7113 7177 7320 7337 7422 7466 7542 7771 7836 7927 8080 8536 9337 10244 10256 10354 10632 11659 11734 12186 12995 13333 13643 13731 14013 14109 14220 14604 14693 15303 15355 15363 15715 15730 15995 16013 16023 16056 16150 16895 17061 17573 17656 17731 17764 17852 19718 19799 19868 20137 20208 20893 20973 21174 21273 21286 21423 21469 21572 21612 21738 21768 21829 21940 22199 22293 22360 22518 22932 23230 23538 23843 24262 25571 25608 26562 26704 27014 27076 27386 27604 27976 28104 28133 28276 28436 28487 28660 29391 29712 30735 31444 32045 32096 32328 32348 32509 36714 40355 40588 40618 40644 44333 44347 48816 48852 48943 48980https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/705/A38?format=asciiOpticaldefaultJ/A+A/705/A38/tablea1Stellar parameters and abundances of Sr, Zr, Mo, RurecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identifier in the HD or BD cataloguesmeta.id;meta.maincharTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravity (logg)log(cm.s**-2)phys.gravityfloat[Fe/H]Metallicity [Fe/H]phys.abund.ZfloatVtMicroturbulent velocitykm/sphys.velocfloat[Sr/Fe]? Abundance [Sr/Fe]phys.abundfloatnullablee_[Sr/Fe]? Error on [Sr/Fe]stat.error;phys.abundfloatnullable[Zr/Fe]? Abundance [Zr/Fe]phys.abundfloatnullablee_[Zr/Fe]? Error on [Zr/Fe]stat.error;phys.abundfloatnullable[Mo/Fe]? Abundance [Mo/Fe]phys.abundfloatnullablee_[Mo/Fe]? Error on [Mo/Fe]stat.error;phys.abundfloatnullable[Ru/Fe]? Abundance [Ru/Fe]phys.abundfloatnullablee_[Ru/Fe]? Error on [Ru/Fe]stat.error;phys.abundfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_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