Discovery of a pulsar in a binary system

Details Discovery of a pulsar in a binary system Discovery of a pulsar in a binary system

Jan 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...195l..51h&link_type=abstract

Astrophysical Journal, vol. 195, Jan. 15, 1975, pt. 2, p. L51-L53.

Astronomy and Astrophysics

Astronomy

580

Binary Stars, Orbital Elements, Pulsars, Relativistic Effects, Black Holes (Astronomy), Companion Stars, Eccentric Orbits, Mass Ratios, Neutron Stars, Radial Velocity, Velocity Distribution

Scientific paper

We have detected a pulsar with a pulsation period that varies systematically between 0.058967 and 0.059045 sec over a cycle of 0.3230 d. Approximately 200 independent observations over 5-minute intervals have yielded a well-sampled velocity curve which implies a binary orbit with projected semimajor axis sin i = 1.0 solar radius, eccentricity e = 0.615, and mass function f(m) = 0.13 solar mass. No eclipses are observed. We infer that the unseen companion is a compact object with mass comparable to that of the pulsar. In addition to the obvious potential for determining the masses of the pulsar and its companion, this discovery makes feasible a number of studies involving the physics of compact objects, the astrophysics of close binary systems, and special- and general-relativistic effects.

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