Copernicus and Ariel V observations of Hercules X-1

Details Copernicus and Ariel V observations of Hercules X-1 Copernicus and Ariel V observations of Hercules X-1

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.178p...1d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 178, Jan. 1977, p. 1P-8P.

Astronomy and Astrophysics

Astronomy

16

Eclipsing Binary Stars, Periodic Variations, Satellite Observation, X Ray Sources, Ariel 5 Satellite, Doppler Effect, Light Curve, Oao 3, Stellar Motions

Scientific paper

Observations of the binary X-ray source Her X-1 by Copernicus and Ariel V instruments are reported and analyzed. The long-period (about 35 days) modulation of the 1.24-sec and 1.7-day eclipse periods, and the on-state and off-state of the source, are discussed. Estimates derived from Doppler shift of the zero phase of the binary orbit are given, along with a new value for the 1.24-sec pulsation period.

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