Observations of Hercules X-1 with SAS-3 during 1975 July

Details Observations of Hercules X-1 with SAS-3 during 1975 July Observations of Hercules X-1 with SAS-3 during 1975 July

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214..874j&link_type=abstract

Astrophysical Journal, Part 1, vol. 214, June 15, 1977, p. 874-878.

Astronomy and Astrophysics

Astrophysics

28

Eclipsing Binary Stars, Electromagnetic Pulses, Satellite-Borne Instruments, X Ray Sources, Doppler Effect, Phase Shift, Time Dependence

Scientific paper

X-ray pulsations from Her X-1 with energies between 0.1 and 30 keV were observed for four days with the SAS-3 satellite, during the 1975 July-August ON state of the source. The existence of a strong flux between 0.1 and 0.4 keV, with pulsations that are out of phase with those above 1 keV, is confirmed. A pulsed flux in the 19-30 keV band was discovered. The average fractional rate of change in pulse period between 1972 and 1975 was about 3 x 10 to the -6th/yr, and the absolute value of the average fractional rate of change in orbital period during the same interval was not greater than 5 x 10 to the -7th/yr

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