The high-energy pulsed X-ray spectrum of HER X-1 as observed with OSO-8

Details The high-energy pulsed X-ray spectrum of HER X-1 as observed with OSO-8 The high-energy pulsed X-ray spectrum of HER X-1 as observed with OSO-8

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phdt.........7m&link_type=abstract

Ph.D. Thesis - Catholic Univ. of America National Aeronautics and Space Administration. Goddard Space Flight Center, Greenbelt,

Physics

1

Oso-8, Pulsed Radiation, Stellar Spectra, X Ray Spectra, Flux Density, High Frequencies, Scintillation Counters

Scientific paper

Her X-1 was observed from 1977 August 30 to September 10 using the High-Energy X-Ray Scintillation Spectrometer on board the OSO-8 satellite. The observation, during which the source was monitored continually for nearly an entire ON-state, covered the energy range from 16 to 280 keV. Pulsed flux measurements as a function of binary orbit and binary phase are presented for energies between 16 and 98 keV. The pulsed flux between 16 and 33 keV exhibited a sharp decrease following the fourth binary orbit and was consistent with zero pulsed flux thereafter. The pulsed spectrum was fitted with a power law, a thermal spectrum without features, and a thermal spectrum with a superposed gaussian centered at 55 keV. The latter fit has the smallest value of chi - squared per degree of freedom, and the resulting integrated line intensity is 1.5 superscript + 4.1 subscript - 1.4 x .001 photons s superscript-1 cm superscript-2 for a width of 3.1 superscript + 9.1 subscript -2.6 keV. This result, while of low statistical significance, agrees with the value observed by Trumper (1978) during the same On-state.

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