Evidence for apsidal motion in the Cygnus X-1 system and a third-body interpretation

Details Evidence for apsidal motion in the Cygnus X-1 system and a third-body interpretation Evidence for apsidal motion in the Cygnus X-1 system and a third-body interpretation

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981aj.....86.1259w&link_type=abstract

Astronomical Journal, vol. 86, Aug. 1981, p. 1259-1266.

Astronomy and Astrophysics

Astronomy

9

Apsides, Binary Stars, Celestial Mechanics, Stellar Motions, X Ray Stars, Light Curve, Orbit Perturbation, Three Body Problem

Scientific paper

Evidence for elliptical orbit rotation with a period of 4.5 years has been found upon comparison of the light curves of the HDE 226868-Cyg X-1 system, made in six consecutive observing seasons, with model light curves. The rotation, if real, is too fast to be due to the finite mass distribution of the optical star because the star is highly evolved and must have a high degree of central condensation. The explanation favored involves a perturbing third body, and the relations given by Lidov and Ziglin (1976) to find the expected mass-distance relation are used. A range of examples is found which would be sufficiently hierarchical to be stable against disruption.

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