White dwarfs are the most common end-product of stellarevolution, and as such contain valuable information about the evolutionof individual stars as well as about the star formation history andsubsequent evolution in our ...

Aims. We examine a recently-proposed evolutionary scenario that could explain the existence of the low-mass, helium-enriched PG 1159 stars. We focus in particular on studying the pulsational stability properties of the ...

Aims. Stars in the narrow mass range of about 2.5 and 3.5 M can develop a thermally unstable He-burning shell during its ignition phase. We study, from the point of view secular stability theory, these so-called thermal ...

Aims. We present full evolutionary calculations appropriate to post-AGB PG 1159 stars for a wide range of stellar masses. Methods. We take into account the complete evolutionary stages of PG 1159 progenitors starting from ...