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  • Discovery of a hot ultramas...
    Pshirkov, M S; Dodin, A V; Belinski, A A; Zheltoukhov, S G; Fedoteva, A A; Voziakova, O V; Potanin, S A; Blinnikov, S I; Postnov, K A

    Monthly notices of the Royal Astronomical Society. Letters, 11/2020, Letnik: 499, Številka: 1
    Journal Article

    ABSTRACT 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 ± 0.9 pc. Its radius, mass, effective temperature, H/He ratio, and age are R = 2500 ± 100 km, M = 1.33 ± 0.01 $\rm M_{\odot }$, Teff = 31 200 ± 1200 K, H/He ∼ 0.1, and 330 ± 40 Myr, respectively. The observed spectrum is redshifted by Vr = +240 ± 15 km s−1, which is mostly attributed to the gravitational redshift. The white dwarf shows a regular stable photometric variability with amplitude Δg ≈ 0.06m and period P = 353.456 s suggesting rapid rotation. This massive, hot, and rapidly rotating white dwarf is likely to originate from the merging of close binary white dwarf system that avoided explosion in a thermonuclear Type Ia supernova.