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We report the discovery of a strong magnetic field in the unique pulsatingcarbon-atmosphere white dwarf SDSS J142625.71+575218.3. From spectra gatheredat the MMT and Keck telescopes, we infer a surface field of B_s ~1.2 MG, basedon obvious Zeeman components seen in several carbon lines. We also detect thepresence of a Zeeman-splitted He I 4471 line, which is an indicator of thepresence of a non-negligible amount of helium in the atmosphere of this Hot DQstar. This is important for understanding its pulsations, as nonadabatic theoryreveals that some helium must be present in the envelope mixture for pulsationmodes to be excited in the range of effective temperature where the target staris found. Out of nearly 200 pulsating white dwarfs known today, this is thefirst example of a star with a large detectable magnetic field. We suggest thatSDSS J142625.71+575218.3 is the white dwarf equivalent of a roAp star.

SDSS J142625.71+575218.3: The First Pulsating White Dwarf with a Large Detectable Magnetic Field