Title: A homogeneous study of the s-process in the 21 mu m carbon-rich post-AGB objects
Authors: Van Winckel, Hans ×
Reyniers, Maarten #
Issue Date: Feb-2000
Publisher: Springer verlag
Series Title: Astronomy & astrophysics vol:354 issue:1 pages:135-149
Abstract: We present in this paper a homogeneous photospheric abundance study, on the basis of the analysis of high resolution optical spectra, of six post-AGE objects displaying a 21 mu m circumstellar dust feature in their IR spectrum. The F-G spectral type of the 21 mu m stars make that a large range of elements including a wide variety of s-process elements, can be studied by their atomic lines. The high C/O-ratios together with the large overabundance of s-process elements prove that the objects are descendants of field carbon stars. We discuss in detail the s-process abundance distribution displayed by these 21 mu m stars and conclude that the 3rd dredge-up efficiency is closely related to the strength of the integrated neutron irradiation. The expected anti-correlation of the neutron irradiation with metallicity, on the other hand, contains a large intrinsic scatter. Finally we compare our results with other intrinsic and extrinsic s-process enriched objects and conclude that the post-AGB stars offer very useful complementary data to constrain the evolutionary models of AGE nucleosynthesis and dredge-up processes.
ISSN: 0004-6361
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
× corresponding author
# (joint) last author

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