Relativistic phenomena (orbital precession, Shapiro delay, and/or orbital decay) have been measured in Arecibo timing observations of four pulsar-white dwarf binaries, leading to constraints on the neutron star masses. We have detected the decay of the PSR J0751+1807 orbit due to gravitational radiation emission, the first such measurement in a binary with a low mass ratio (m2/m1 << 1). Timing data constrains the mass of this pulsar to bet between 1.6 and 2.8 Msun. Masses of the other pulsars are in marginal agreement with the canonical pulsar mass of 1.35 Msun, but higher values are preferred.
Young Neutron Stars and Their Environments
- Pub Date:
- 4 pages, 1 figure. To appear in "Young Neutron Stars and Their Environments" (IAU Symposium 218, ASP Conference Proceedings), eds F. Camilo and B. M. Gaensler