Binary and millisecond radio pulsars

Recent pulsar surveys, especially those using the multibeam receiver on the Parkes radio telescope, have more than doubled the number of known pulsars, bringing the current total to about 1720. Of these, 171 have millisecond periods, 126 are members of binary systems and 99 are associated with globular clusters. Binary pulsars may be divided into several distinct groups depending on their observed properties such as pulsar period and age, binary period, eccentricity and companion mass. These groups all have different evolutionary histories. Correlations between the various properties are discussed using the increased samples now available. The Parkes Pulsar Timing Array is a project which has the goal of using timing observations of millisecond pulsars to make a direct detection of gravitational waves. The parameters and present status of the project are briefly discussed.