Constraints on the apsidal motion of some galactic X-ray sources

Details Constraints on the apsidal motion of some galactic X-ray sources Constraints on the apsidal motion of some galactic X-ray sources

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....60..431t&link_type=abstract

Astronomy and Astrophysics, vol. 60, no. 3, Sept. 1977, p. 431, 432.

Astronomy and Astrophysics

Astrophysics

2

Apsides, Binary Stars, Precession, Variable Stars, X Ray Sources, Cygnus Constellation, Eccentric Orbits, Milky Way Galaxy, Periodic Variations, Photometry

Scientific paper

Periodicities on the order of ten days observed in the Cyg X-3, Cyg X-2, and AO 620-00 binary X-ray sources are discussed. It is suggested that the periodicities may be caused by apsidal precession. Optical photometric and X-ray data are used in analyzing the periodicities; corresponding eccentricities in the range of 0.5 to 0.7 (comparable to the highest observed eccentricity of a binary pulsar) are calculated. Further investigations, relying on direct observation of eccentricity from shifts in spectral lines, are proposed to clarify the findings.

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