AE Aquarii

A white dwarf star, AE Aquarii emits pulses of high-energy X-rays as it whirls around on its axis like the white dwarf equivalent of a pulsar. The star spins very rapidly and has a magnetic field millions of times stronger than a planet.

X-ray emissions

The X-ray emissions from the star match its spin period of once every 33 seconds. The pulsations are very similar to those of the pulsar in the center of the Crab Nebula. In both objects, the pulses appear like a lighthouse beam, and a rotating magnetic field is thought to be controlling the beam. The extremely powerful magnetic field is trapping charged particles and then flinging them outward at near-light speed. When the particles interact with the magnetic field, they radiate X-rays.