Detection of elements beyond the Ba-peak in VLT+UVES spectra of post-AGB stars

Abstract

In this letter, we report on our successful systematic search for lines of elements beyond the Ba-peak in spectra of s-process enriched post-AGB stars. Using newly released atomic data from both the VALD database and the D.R.E.A.M. project, we could derive abundances for several elements heavier than europium for three objects, on the base of high quality VLT+UVES spectra. The abundances of these elements are of particular interest since they turn out to be powerful constraints for chemical evolutionary AGB models. Their high abundances indicate that, also in only moderately metal deficient AGB stars, production of lead is expected to be significant.

arXiv comment5 pages, 2 figures, accepted for publication as A&A Letter

References in corpus (4)

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• s-Processing in AGB Stars Revisited. III. Neutron captures from MHD mixing at different metallicities and observational constraints
• Post-AGB stars in the Magellanic Clouds and neutron-capture processes in AGB stars
• Detailed abundance study of four s-process enriched post-AGB stars in the Large Magellanic Cloud
• IRAS08281-4850 and IRAS14325-6428: two A-type post-AGB stars with s-process enrichment
• New Post-AGB star models as tools to understand AGB evolution and nucleosynthesis
• IRAS\,11472-0800: an extremely depleted pulsating binary post-AGB star
• Discovery of a Metal-poor, Luminous Post-AGB Star that Failed the Third Dredge-up
• s-process Enriched Evolved Binaries in the Galaxy and the Magellanic Clouds