2000A&A...364L..66K

We report new spectroscopic and photometric observations of the white dwarf companion to the pulsar PSR B0820+02. The white dwarf is a normal DA white dwarf with an effective temperature of 15000K and a mass of 0.6M_☉. The mass and orbital period of this system confirm recent simulations of the evolution of a neutron star - main sequence binary with mass exchange and thus implicitely theoretical predictions of the dependence of the red giant radius on the He-core mass. The cooling age of the white dwarf is larger than the spin-down age of the pulsar, unless a braking index of 2.2 is assumed.