  We have detected relativistic and/or kinematic post-Keplerian parameters of
no fewer than five pulsar-white dwarf binary systems in long-term timing
observations at Arecibo. We discuss the resulting constraints on pulsar and
companion masses. The general trend is that the pulsar mass measurements are
compatible with the canonical value of 1.35 solar masses, but in most cases
somewhat higher masses are preferred.

Astrophysics