Hydrogen-Deficient Stars in Pre-WD Stages

Details Hydrogen-Deficient Stars in Pre-WD Stages Hydrogen-Deficient Stars in Pre-WD Stages

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..334..341h&link_type=abstract

14th European Workshop on White Dwarfs, ASP Conference Series, Vol. 334 Proceedings of a meeting held at Kiel, July 19-23, 2004

Astronomy and Astrophysics

Astronomy

Scientific paper

Among the Central Stars of Planetary Nebulae, about 20% are hydrogen-deficient at their surface (spectral types [WC], wels, PG1159). Because of strong mass-loss, their spectra are formed in a stellar wind and require adequate modelling for their analysis. Corresponding Non-LTE model atmospheres have been developed in the last decade. They have been applied extensively for analyzing the spectra of these hydrogen-deficient white dwarf progenitors, establishing their stellar parameters and surface compositions. The results provide the basis for the discussion of their evolutionary status and have initiated efforts to develop new calculations for the post-AGB evolution which account consistently for diffusive mixing and nuclear burning.

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