PSR 1913 +16 Research Articles

The masses of two binary neutron star systems

The measurement or constraint of the masses of neutron stars and their binary companions tests theories of neutron star structure and of pulsar formation and evolution. We have measured the rate of the general relativistic advance of the longitude of periastron for the pulsar PSR B1802$-$07: $\dot\omega=0\fdg060\pm0\fdg009\,\mbox{yr}^{-1}$, which implies a total system mass, pulsar plus companion star, of $M=1.7\pm0.4\,\Msun$. We also present a much improved measurement of the rate of periastron advance for PSR B2303+46: $\dot\omega = 0\fdg0099\pm0\fdg0002\,\mbox{yr}^{-1}$, implying $M=2.53\pm0.08\,\Msun$ for this system. We discuss the available constraints on distribution of mass between the pulsars and their companions, and we compare the pulsar masses with other determinations of neutron star masses.

Astrometry and photometry of stars in the vicinity of the Hulse-Taylor binary pulsar

view Abstract Citations (3) References (8) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Astrometry and photometry of stars in the vicinity of the Hulse-Taylor binary pulsar. Shao, C. -Y. ; Liller, W. Abstract Deep blue and near-infrared (0.7-0.9 i m) plates taken during periods of good seeing with the 4 m telescope of the Cerro Tololo Inter-American Observatory are used to derive coordinates, magnitudes, and colors for faint stars in the vicinity of the Hulse-Taylor binary pulsar. No convincing candidates are found, and new limits are set on the optical visibility of the system. Subject heading: pulsars Publication: The Astrophysical Journal Pub Date: July 1978 DOI: 10.1086/156259 Bibcode: 1978ApJ...223..266S Keywords: Astrometry; Astronomical Photometry; Pulsars; Star Distribution; Infrared Imagery; Photographic Plates; Astronomy; Pulsar Neighborhood:Stellar Spectra; Pulsars: Optical Counterparts full text sources ADS | data products SIMBAD (1)

Gravitational two-body problem—A source theory viewpoint

An analysis of the semirelativistic gravitational two-body problem based on Schwinger's source theory is given. Our treatment is purely classical but nongeometrical. Only the large distance behavior of the gravitational stress tensor is seen to be relevant for order G 2 contributions. For a gravitational stress tensor that has a pure Newtonian form, only the traceless choice is seen to be consistent with Einstein's theory. We find results in agreement with the earlier results of Einstein, Infeld, and Hoffmann, and Barker and O'Connell for spin-2 graviton exchanges between Dirac particles, and with Börner, Ehlers, and Rudolph for spin precession in theories with arbitrary post-Newtonian parameter γ. The source approach clearly displays the analogy between gravitational interactions and classical electrodynamics. We also discuss the general relationship between the periastron advance and spin-precession frequencies for a class of gravitation theories. Brief estimates of the various spin-precession effects are given for the Hulse-Taylor pulsar.