Abstract
ABSTRACT The spin period (185 ms) and period derivative ( 1.8 × 10 − 17 s s − 1 ?> ) 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 ≲ 3.0 M ⊙ ?> . We find that the probability distribution of the velocity kick imparted to the new-born neutron star has a maximum at about 30 km s − 1 ?> (and a tail up to 260 km s − 1 ?> ), indicating that this NS probably received a low kick velocity at birth.
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