SIMBAD references

The spin period (185 ms) and period derivative (1.8 x 10^–17 s/s) of the recently discovered double neutron star (DNS) system PSR J1930-1852 indicate that the pulsar was mildly recycled through the process of Roche-lobe overflow. This system has the longest orbital period (45 days) of the known DNS systems, and can be formed from a helium star-NS binary if the initial mass of the helium star was ≲ 4.0 M_☉ otherwise, the helium star would never fill its Roche-lobe. At the moment of the supernova explosion, the mass of the helium star was ≲ 30 M_☉. We find that the probability distribution of the velocity kick imparted to the new-born neutron star has a maximum at about 30km/s (and a tail up to 260 km/s), indicating that this NS probably received a low kick velocity at birth.