Discovery of a Magnetic White Dwarf with Unusual Short-period Variability
2018
We report the discovery of a magnetic white dwarf which shows periodic variability with P = 110 min, colordependent
amplitudes and a transient phase shift in the blue compared to the red lightcurve – a previously unknown
type of variability for this type of object. We attribute the variations either to a close ultracool (thus far undetected)
companion or, more likely, to magnetic spots with unusual temperature structure
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