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The relatively high abundance of carbon in the hot DO white dwarf RE0503-289indicates that it is a descendant of a PG1159 star. This is corroborated by therecent detection of the extremely high abundances of trans-Fe elements whichstem from s-process nucleosynthesis in the precursor AGB star, dredged up by alate He-shell flash and possibly amplified by radiative levitation. On theother hand, the hottest known DO white dwarf, KPD0005+5106, cannot have evolvedfrom a PG1159 star but represents a distinct He-rich evolutionary sequence thatpossibly originates from a binary white dwarf merger.

Metal Abundances in Hot DO White Dwarfs