A fresh look into pulsating PG1159 stars
  To improve the understanding of the pulsational instabilities of some of the PG1159-type pre-white dwarfs we performed detailed stability analyses on helium star evolutionary models. With the canonical chemical compositions, pulsational instabilities were encountered for all stellar masses considered (0.57, 0.63, 0.7 M_sol). The blue boundary agrees satisfactorily with observations. The red edge, on the other hand, is found to extend lower temperatures than presently admitted by observers. The dependence of the pulsational instabilities on helium or even hydrogen abundance in the stellar envelopes is less stringent than emphasized hitherto. In particular, we found pulsationally unstable g-modes for model stellar envelopes which are representative for HS2324+3944, a newly discovered PG1159-star with a hydrogen abundance X of approximately 0.2 and being pulsating. 
Alfred Gautschy (Universitaet Basel)