A Subaru/HDS study of Lead (Pb) abundances in eight s-process-element-rich, metal-poor stars

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dc.creatorAoki, W.
dc.creatorRyan, S. G.
dc.creatorNorris, J. E.
dc.creatorBeers, T. C.
dc.creatorAndo, H.
dc.date2002-08-01
dc.date.accessioned2026-07-07T10:47:27Z
dc.date.available2026-07-07T10:47:27Z
dc.descriptionWe report the abundances of neutron-capture elements in eight carbon-rich, metal-poor (-2.7=<[Fe/H]=<-1.9) stars observed with the Subaru Telescope High Dispersion Spectrograph. The derived abundance patterns indicate that the neutron-capture elements in these objects primarily originated from s-process nucleosynthesis, although the [Ba/Eu] abundance ratios in some objects are lower than that of the solar-system s-process component. The present analysis has yielded the Pb abundances for seven objects, as well as an upper limit for one object, from use of the Pb I 4057A and 3683A lines. The values of [Pb/Ba] in these objects cover a wide range, between -0.3 and +1.2. Theoretical studies of s-process nucleosynthesis at low metallicity are required to explain this large dispersion of the [Pb/Ba] values. Variations in radial velocity have been found for two of the eight objects, suggesting that, at least in these instances, the observed excess of s-process elements is due to the transfer of material across a binary system including an AGB star. Comparisons with predictions of AGB nucleosynthesis models are discussed.
dc.description23 pages, 3 figures, ApJ, in press
dc.identifierhttps://arxiv.org/abs/astro-ph/0208020
dc.identifierhttp://arxiv.org/abs/astro-ph/0208020
dc.identifierAstrophys.J.580:1149-1158,2002
dc.identifierdoi:10.1086/343885
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/183540
dc.subjectAstrophysics
dc.titleA Subaru/HDS study of Lead (Pb) abundances in eight s-process-element-rich, metal-poor stars
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