Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-09-28
Astronomy and Astrophysics
Astrophysics
6 pages, 7 figures, to appear in the proceedings of: "The Galactic Halo: from Globular Clusters to Field Stars"; 35'th Liege I
Scientific paper
The 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.
Reyniers Maarten
Winckel Hans Van
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