Hercules X-1 - The 70 day period

Details Hercules X-1 - The 70 day period Hercules X-1 - The 70 day period

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213l...9c&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 213, Apr. 1, 1977, p. L9-L12. NSF-supported research.

Astronomy and Astrophysics

Astrophysics

8

Eclipsing Binary Stars, Pulsars, X Ray Sources, Beat Frequencies, Degrees Of Freedom, Periodic Variations, Statistical Analysis, Stellar Spectra, X Ray Spectra

Scientific paper

An analysis of the 'dips' which appear in the X-ray intensity of Her X-1 suggests that their fundamental period is 1.66 days. This period corresponds to the beat frequency nu(1.7 days) + nu(70 days). If the dips are caused by a precessing disk, then the precession period of the disk is 70 days. Two sets of dips appear to be present. There is an intrinsic scatter in the dip occurrences of the order of 0.05 days.

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