Spectroscopic Analysis of Two Carbon Rich Post-AGB Stars

Details Spectroscopic Analysis of Two Carbon Rich Post-AGB Stars Spectroscopic Analysis of Two Carbon Rich Post-AGB Stars

2001-09-05

arxiv.org/abs/astro-ph/0109068v1

Astrophys.J. 564 (2002) 482-494

Astronomy and Astrophysics

Astrophysics

41 pages (including 10 figs). 2001, ApJ, Accepted

Scientific paper

10.1086/324216

The chemical compositions of the C-rich 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.

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