Hercules X-1 - The 1.24 second pulsation in hard X-rays

Details Hercules X-1 - The 1.24 second pulsation in hard X-rays Hercules X-1 - The 1.24 second pulsation in hard X-rays

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217l..93k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 217, Oct. 15, 1977, p. L93-L96. Research supported by the Deutsche F

Astronomy and Astrophysics

Astrophysics

19

Eclipsing Binary Stars, Pulsars, X Ray Sources, Balloon-Borne Instruments, Light Curve, Oso-8, Periodic Variations, Thomson Scattering, Uhuru Satellite

Scientific paper

A 4-hr balloon observation of Hercules X-1 during the ON state in the 35-day cycle was performed. The 1.24-s pulsations show a pulsed fraction of 58% + or - 8% in the 18-31-keV interval. A pulsed flux was discovered in the 31-88-keV range with a pulsed fraction of 51% + or - 14%. In the 18-60-keV range the 1.24-s pulsations are characterized by single-peaked pulses (width 250 ms FWHM), showing no significant change with energy of pulse shape and phase of the pulse maximum. At energies above 60 keV evidence is found for a double-peaked pulse profile.

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