Research on the Evolution of Binary Pulsar Systems from the Decay of Magnetic Energy at the Light Cylinder

The evolutionary history of binary pulsars based on the decay of magnetic energy at the light cylinder is studies in this paper.The formulae for the two radiative ages t₀ and t_d from the minimum period, P_min, in the accerative phase to the present peroid, p(t₀), and the radio radiation cut-off line are given.The time, t_f, when the pulsars arrive at the radiation cut-off line from the present radiative age and the peroid, P_f, at which the pulsars will arrive at the radio radiation cut-off line in t_f are also given.In addition, the numerically calculated results for seven binary pulsars are listed in Table 1.