Long-term Behaviour of Hercules X-1

Details Long-term Behaviour of Hercules X-1 Long-term Behaviour of Hercules X-1

Jul 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973natur.244..212f&link_type=abstract

Nature, Volume 244, Issue 5413, pp. 212-213 (1973).

Computer Science

16

Scientific paper

HER X-1 was observed with the Copernicus satellite X-ray detectors on June 5 this year. This date was chosen because it was predicted to be within an ``extended low'' of the 35-day cycle reported by Giacconi et al.1. The purpose of the observation was to search for the steady soft component, hypothesized2,3 to account for the persistence through the ``extended lows'' of the ~1.5 mag amplitude, 1.7 d period, optical variations which are generally attributed to heating of one face of the companion star by the X-ray source. We report here the unexpected result that Her X-1 was detected in the 4 to 12 keV channel (overlapping with the energy range covered by Uhuru), at an intensity comparable with the previously measured ``high state'' intensity.

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