2001/09/05 by Bacham E. Reddy, David L. Lambert, G. Gonzalez +2 · 1 citation
Physics and Astronomy · #Abundance (ecology) #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Astrophysics and Star Formation Studies #Asymptotic giant branch #Biology #Carbon fibers #Carbon star #Ecology #Giant star #Lithium (medication) #Materials science #Nucleosynthesis #Physics #Spectral line #Stars #Stellar, planetary, and galactic studies #astro-ph #s-process
paper · pdf · doi:10.1086/324216
published as Astrophys.J. 564 (2002) 482-494 · 41 pages (including 10 figs). 2001, ApJ, Accepted
arxiv created 2001/09/05 · openalex publication_date 2002/01/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The chemical compositions of the C-rich post-asymptotic giant branch (pAGB) stars IRAS 05113+1347 and IRAS 22272+5424 are determined from high-resolution optical spectra using standard LTE model atmosphere-based techniques. The stars are C, N, and s -process enriched, suggesting efficient operation of the third dredge-up in the AGB star following a first dredge-up that increased the N abundance. Lithium is present with an abundance requiring Li manufacture. With this pair, abundance analyses are now available for 11 C-rich pAGBs. A common history is indicated and, in particular, the s -abundances, especially the relative abundances of light to heavy s -process elements, follow recent predictions for the third dredge-up in AGB stars.