The magnetic fields and original spins of binary and runaway pulsars

Pulsing X-ray sources are believed to be the progenitors of binary and runaway pulsars. Thus, their observed properties and predicted fates furnish information about the initial properties and evolution of these pulsars. Evidence is discussed which suggests that many binary and runaway pulsars are born with periods approximately seconds and dipole magnetic fields approximately 1011-1013 G, and that the turnoff of at least some is not due to decay of their dipole magnetic fields. (Auth.)