Abstract
view Abstract Citations (24) References (12) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Hercules X-1: the 1.24 second pulsation in hard X-rays. Kendziorra, E. ; Staubert, R. ; Pietsch, W. ; Reppin, C. ; Sacco, B. ; Truemper, J. Abstract 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. Publication: The Astrophysical Journal Pub Date: October 1977 DOI: 10.1086/182546 Bibcode: 1977ApJ...217L..93K Keywords: Eclipsing Binary Stars; Pulsars; X Ray Sources; Balloon-Borne Instruments; Light Curve; Oso-8; Periodic Variations; Thomson Scattering; Uhuru Satellite; Astronomy full text sources ADS |
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