Probing S-Process Yields of Field Carbon Stars by the Analysis of 21micron Post-AGB Stars

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dc.creatorReyniers, M.
dc.creatorVan Winckel, H.
dc.date1999-09-28
dc.date.accessioned2026-07-07T06:32:08Z
dc.date.available2026-07-07T06:32:08Z
dc.descriptionThe observational data guiding the theoretical chemical evolutionary models of AGB stars come mainly from the analysis of intrinsic and extrinsic s-process enriched objects. The first are the stars of the M-MS-S-SC-C star sequence which is thought to reflect, at least partly, the evolution on the AGB of a single star towards an increasing C/O ratio. The second are all binaries with excess abundances acquired by mass-transfer from the companion which is now a white dwarf. In this contribution we present a homogeneous abundance analysis of 21micron objects, which are carbon-rich probably single post-AGB stars. With their F to G spectral types a wide variety of chemical species can be studied quantitatively by using photospheric atomic lines. These objects are among the most s-process enriched objects known so far. We focus on the s-process distribution and the related neutron irradiation and compare the results with the enrichments observed in both intrinsic and extrinsic objects.
dc.description6 pages, 7 figures, to appear in the proceedings of: "The Galactic Halo: from Globular Clusters to Field Stars"; 35'th Liege Int. Astroph. Coll., 1999
dc.identifierhttps://arxiv.org/abs/astro-ph/9909461
dc.identifierhttp://arxiv.org/abs/astro-ph/9909461
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/98811
dc.subjectAstrophysics
dc.titleProbing S-Process Yields of Field Carbon Stars by the Analysis of 21micron Post-AGB Stars
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