WD 0816–310 (PM J08186–3110) is a magnetic white dwarf with metal pollution, originating from the tidal disruption of a planetary body.

The elements sodium, magnesium, calcium, chromium, manganese, iron and nickel were detected in the atmosphere of the white dwarf.

Around 310,000 years ago WD 0816–310 accreted a Vesta-sized object with a composition similar to chondritic meteorites.

[3] The observations showed that the variation metal line strength and magnetic field intensity are synchronized.

On their way to the poles of the white dwarf, the ions will collide with neutral atoms in the gas disk, ionizing them in the process.