We discovered two bright DO-type white dwarfs , GALEX J053628.3+544854 ( J0536+5448 ) and GALEX 231128.0+292935 ( J2311+2929 ) , which rank among the eight brightest DO-type white dwarfs known .
Our non-LTE model atmosphere analysis reveals effective temperatures and surface gravities of \mbox { $T _ { \mathrm { eff } } $ } \hskip { -1.422638 pt } = \hskip { -1.422638 pt } 80000 \pm 4600 % \mathrm { K } and \log g \hskip { -1.422638 pt } = \hskip { -1.422638 pt } 8.25 \pm 0.15 for J0536+5448 and \mbox { $T _ { \mathrm { eff } } $ } \hskip { -1.422638 pt } = \hskip { -1.422638 pt } 69400 \pm 900 % \mathrm { K } and \log g \hskip { -1.422638 pt } = \hskip { -1.422638 pt } 7.80 \pm 0.06 for J2311+2929 .
The latter shows a significant amount of carbon in its atmosphere ( C = 0.003 ^ { +0.005 } _ { -0.002 } , by mass ) , while for J0536+5448 we could derive only an upper limit of C < 0.003 .
Furthermore , we calculated spectroscopic distances for the two stars and found a good agreement with the distances derived from the Gaia parallaxes .