Metric of two spinning charged sources endowed with the Newman--Tamburino--Unti parameter

Following the approach of Israel, Wilson, and Perjes, we give the explicit form of the metric corresponding to two Kerr-Newman sources in equilibrium endowed with opposite values of the Taub--Newman--Tamburino--Unti parameters. The two solutions have equally and oppositely directed spin vectors. The explicit structure of the electromagnetic fields is given for the case where the two sources are separate, and in the limit their separation goes to zero (coalescence). The asymptotic form of the metric is regular for r→+infinity; and when the separation of the two solutions is not zero, the electromagnetic field asymptotically approaches an electric monopole and a magnetic dipole field