DOIAbstract
We present a comprehensive study of Far Ultraviolet Spectroscopic Explorer (FUSE) spectra (912–1190 Å) of two members of the PG 1159 spectral class, which consists of hydrogen-deficient (pre-) white dwarfs with effective temperatures in the range Teff = 75 000–200 000 K. As two representatives of the cooler objects, we have selected PG 1707+427 (Teff = 85 000 K) and PG 1424+535 (Teff = 110 000 K), complementing a previous study of the hotter prototype PG 1159−035 (Teff = 140 000 K). The helium-dominated atmospheres are strongly enriched in carbon and oxygen, therefore, their spectra are dominated by lines from C iii-i
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