We discovered two bright DO-type white dwarfs, GALEXJ053628.3+544854 (J0536+5448) and GALEX231128.0+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 $T_{ \mathrm{ eff}}=80000\pm4600\,\mathrm{ K}$ and $\log \mathrm{ g}=8.25\pm0.15$ for J0536+5448 and $T_{ \mathrm{ eff}}=69400\pm900\,\mathrm{ K}$ and $\log \mathrm{ g}=7.80\pm0.06$ 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.
Categories: astro-ph.SR