A line feature at 64 keV in the X-ray spectrum of HER X-1

Details A line feature at 64 keV in the X-ray spectrum of HER X-1 A line feature at 64 keV in the X-ray spectrum of HER X-1

Aug 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.268..508c&link_type=abstract

Nature, vol. 268, Aug. 11, 1977, p. 508, 509. Research supported by the Science Research Council.

Physics

26

Eclipsing Binary Stars, Line Spectra, Pulsars, Spectrum Analysis, X Ray Spectra, X Ray Stars, Ariel 5 Satellite, Collimators, Energy Spectra, Stellar Magnetic Fields

Scientific paper

A description is presented of X-ray spectrum measurements which were conducted during the ON period from February 3 to February 13, 1977. The scintillation telescope on Ariel 5 used for the measurements covers the energy range from 26 keV to 1.2 MeV and consists of a CsI(Na) actively collimated detector crystal. Her X-1 was observed for 2 d on the rising side of the light curve and 4 d on the falling side. Data from both epochs have been summed and the resulting pulse height spectrum is shown in a graph. The significance of the obtained results is investigated, taking into account observations regarding a hard X-ray line feature reported by Trumper et al. (1976). Separate analyzes of data from the rising and falling side of the X-ray light curve are found to yield both evidence for the line feature.

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