Discovery of Five Recycled Pulsars in a High Galactic Latitude Survey

We present five recycled pulsars discovered during a 21-cm survey of approximately 4,150 deg between 15 and 30 from the galactic plane using the Parkes radio telescope. One new pulsar, PSR J1528−3146, has a 61ms spin period and a massive white dwarf companion. Like many recycled pulsars with heavy companions, the orbital eccentricity is relatively high (∼0.0002), consistent with evolutionary models that predict less time for circularization. The four remaining pulsars have short spin periods (3ms < P < 6ms); three of these have probable white dwarf binary companions and one (PSR J2010−1323) is isolated. PSR J1600−3053 is relatively bright for its dispersion measure of 52.3 pc cm and promises good timing precision thanks to an intrinsically narrow feature in its pulse profile, resolvable through coherent dedispersion. In this survey, the recycled pulsar discovery rate was one per four days of telescope time or one per 600 deg of sky. The variability of these sources implies that there are more millisecond pulsars that might be found by repeating this survey. Subject headings: binaries:close — pulsars: general — stars: neutron — surveys