SIMBAD references

We present a schematic picture of evolution of the low-mass binary system containing the 1s eclipsing radio pulsar PSR 1718-19. We suggest that the evolution of this system prior to the very recent phase was similar to that proposed for the low-mass binaries with millisecond pulsars. We introduce a new physical ingredient in this evolutionary scheme: that the surface magnetic field of very old, low-magnetized neutron stars may strengthen at ages≳10⁸yr and even reach the canonical value of ∼10¹²G. The physical reason for such a latent magnetism of low-magnetized neutron stars is the posibility of formation of a neutron star with the magnetic field buried ∼0.5km under the surface in the highly conducting interior. In this case, the bulk of the magnetic flux needs at least ∼10⁸yr to reach the stellar surface. As the surface magnetic field of an isolated neutron star increases the phase of the active radio pulsar shortens, which substantially reduces the effective number of such objects. We suggest that the effect of latent magnetism may manifest itself in recycled pulsars.