Observations of two Millisecond Pulsars in the Globular Cluster NGC5904

We report on 5 years of pulsar observations of the globular cluster NGC5904 (M5). A timing model has been obtained for the two known pulsars, and a deep search for additional faint isolated pulsars has lowered the detection flux limit to 40 Jy without further detection. We discuss the details and implications of the phase coherent timing models for PSR B1516+02A and PSR B1516+02B. Of particular interest for the binary PSR B1516+02B are the observed negative period derivative due to acceleration in the gravitational field of M5 and a detection of orbital precession. Subject headings: binaries:close, globular clusters:individual (M5, NGC5904), pulsars:individual (PSR B1516+02A, PSR B1516+02B) 1. Introduction Observations of globular clusters over the last decade have revealed a surprisingly large population of radio pulsars. The unique environment found in these old stellar systems produces a class of pulsars that is significantly different from the more populous collection of field pul..