Enanas blancas post-AGB deficientes en Hidrógeno: su evolución espectral PG1159-DB-DQ

PANEI, J. A; ALTHAUS, L. G.; CÓRSICO, A. H.; SERENELLI, A. M.; SCÓCCOLA, C. G.; GARCÍA-BERRO, E.

San Juan, Argentina

Congreso; 47ava reunión anual de la Asociación Argentina de Astronomía; 2004

This work explore the formation and evolution of hydrogen-deficient post-AGB white dwarfs. To this end, we compute the complete evolution of an initially 2.7 M sun star from the ZAMS through the thermally pulsing and mass-loss phases to the white dwarf stage. Particular attention is given to the chemical abundance changes during the whole evolution. The evolution is extended to the domain of the helium-rich, carbon-contaminated DQ white dwarfs to exploring the possible evolutionary connection PG1159-DB-DQ.