Improved parameters for four binary pulsars

Details Improved parameters for four binary pulsars Improved parameters for four binary pulsars

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...332..770t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 332, Sept. 15, 1988, p. 770-776.

Astronomy and Astrophysics

Astrophysics

37

Binary Stars, Periodic Variations, Pulsars, Stellar Evolution, Stellar Structure, Astrometry, Neutron Stars, Orbital Elements, Relativistic Effects

Scientific paper

Timing observations of four of the seven known binary pulsars, PSRs 0655 + 64, 0820 + 02, 1831 - 00, and 2303 + 46, have yielded much improved measurements of their celestial coordinates, periods, period derivatives, and orbital parameters. New upper limits for the orbital eccentricity and rate of change of orbital period of 2 x 10 to the -5th and 1.4 x 10 to the -11th s/s, respectively, are obtained for PSR 0655 + 64. For PSR 0820 + 02, a tight limit of 0.016 deg/yr is placed on the rate of advance of the longitude of periastron. A reliable period derivative of (1.43 + or - 0.18) x 10 to the -17th s/s is obtained for PSR 1831 - 00, and a measurement of the general relativistic advance of periastron is measured at 0.0092 + or - 0.0018/yr for PSR 2303 + 46. The latter value implies a total system mass of 2.3 + or - 0.6 solar masses, probably divided about equally between the pulsar and a neutron star companion.

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