Discovery of a hot ultramassive rapidly rotating DBA White Dwarf

Understand

We report the discovery of a nearby massive white dwarf with He-H atmosphere.

• The white dwarf is located at a distance of $74.5\pm0.9$ pc.
• Its radius, mass, effective temperature, H/He ratio and age are $R=2500\pm100$ km, $M=1.33\pm0.01$ $\rm M_{\odot}$, $T_{\mathrm{eff}}=31200\pm 1200$ K, ${\mathrm{H/He}}\sim0.1$ and $330\pm40$ Myr, respectively.
• The observed spectrum is redshifted by $V_{\mathrm{r}}=+240\pm15$ km s$^{-1},$ which is mostly attributed to the gravitational redshift.