EDP Sciences
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Volume 395, Number 2, November IV 2002
Page(s) L35 - L38
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20021502

A&A 395, L35-L38 (2002)
DOI: 10.1051/0004-6361:20021502


Cerium: The lithium substitute in post-AGB stars

M. Reyniers1, H. V. Winckel1, E. Biémont2, 3 and P. Quinet2, 3

1  Departement Natuurkunde en Sterrenkunde, K.U. Leuven, Celestijnenlaan 200B, 3000 Leuven, Belgium
2  Astrophysique et Spectroscopie, Université de Mons-Hainaut, 7000 Mons, Belgium
3  Institut de Physique Nucléaire, Atomique et de Spectroscopie (IPNAS), Université de Liège, 4000 Liège, Belgium

(Received 2 August 2002 / Accepted 14 October 2002)

In this letter we present an alternative identification for the line detected in the spectra of s-process enriched low-mass post-AGB stars around 6708 Å and which was interpreted in the literature as due to Li. Newly released line lists of lanthanide species reveal, however, the likely identification of the line to be due to a Ce II transition. We argue that this identification is consistent with the Ce abundance of all the objects discussed in the literature and conclude that in none of the low-mass s-process enriched post-AGB stars there is indication for Li-production.

Key words: atomic data -- line: identification -- stars: AGB and post-AGB -- stars: abundances -- stars: chemically peculiar

Offprint request: M. Reyniers, maarten.reyniers@ster.kuleuven.ac.be

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