A return to the pre-1971 intensity level and a 5.6-d modulation for CYG X-1

Details A return to the pre-1971 intensity level and a 5.6-d modulation for CYG X-1 A return to the pre-1971 intensity level and a 5.6-d modulation for CYG X-1

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.261..213h&link_type=abstract

Nature, vol. 261, May 20, 1976, p. 213-215.

Astronomy and Astrophysics

Astronomy

28

Binary Stars, X Ray Astronomy, X Ray Density Measurement, X Ray Stars, Ariel Satellites, Flares, Light Curve, Neutron Stars

Scientific paper

A 5-day modulation in the 'high-state' X-ray intensity data obtained by the Ariel V all-sky monitor for November 1975-January 1976 is reported. The light curve decrement (the fraction of the total source emission over one 5-day cycle which is deficient at superior conjunction) is 0.019 plus or minus 0.003, compared with 0.029 plus or minus 0.004 for a similar 5.6-day modulation observed before the April 1975 flare. The results are most easily explained by scattering from ionized material between the two stellar components which extends outside the orbital plane.

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