Recently it has become clear that there is a group of X-ray pulsars, w
ith pulse periods close to 6 seconds which are distinct from accreting
strongly magnetized neutron stars in X-ray binary systems. Here we ar
gue that these objects are the recent products of the evolution of mas
sive stars. They are unlikely to be neutron stars that formed through
accretion induced collapse of a white dwarf. We propose that they are
single neutron stars accreting from a disk, the recent remnants of the
common-envelope evolution of a high-mass X-ray binary.