Formation and Evolution of Hydrogen-Deficient post-AGB White Dwarfs

Details Formation and Evolution of Hydrogen-Deficient post-AGB White Dwarfs Formation and Evolution of Hydrogen-Deficient post-AGB White Dwarfs

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..334...61a&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

We explore the formation and evolution of hydrogen-deficient post-AGB white dwarf stars by computing the complete evolution of an initially 2.7 Msun star from the ZAMS through the thermally pulsing and mass-loss phases, the born-again stage to the white dwarf stage. A time-dependent scheme for the simultaneous treatment of abundance changes caused by nuclear reactions, diffusive overshooting, salt fingers and convection is considered. In addition, microscopic element diffusion is taken into account during the white dwarf evolution. Relevant aspects for PG 1159 stars and DB evolution are studied in the frame of these new evolutionary models. The scope of the calculations is extended to the domain of the helium-rich, carbon-contaminated DQ white dwarfs with the aim of exploring the plausibility of the evolutionary connection PG 1159-DB-DQ.

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