Elemental Abundances in PG1159 Stars

Details Elemental Abundances in PG1159 Stars Elemental Abundances in PG1159 Stars

2007-10-24

arxiv.org/abs/0710.4506v1

Astronomy and Astrophysics

Astrophysics

To appear in proceedings of "Hydrogen-Deficient Stars" conference, held in Tuebingen, Germany, Sept. 17-21, 2007. 11 pages

Scientific paper

The hydrogen-deficiency in extremely hot post-AGB stars of spectral class PG1159 is probably caused by a (very) late helium-shell flash or a AGB final thermal pulse that consumes the hydrogen envelope, exposing the usually-hidden intershell region. Thus, the photospheric elemental abundances of these stars allow to draw conclusions about details of nuclear burning and mixing processes in the precursor AGB stars. We compare predicted elemental abundances to those determined by quantitative spectral analyses performed with advanced non-LTE model atmospheres. A good qualitative and quantitative agreement is found for many species (He, C, N, O, Ne, F, Si, Ar) but discrepancies for others (P, S, Fe) point at shortcomings in stellar evolution models for AGB stars. PG1159 stars appear to be the direct progeny of [WC] stars.

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