NASA NTRS · 19760018978
Soft X-rays from Her X-1 during the off phase
Abstract
Weak 0.28-keV radiation was observed from Her X-1 5 days before turn-on in the 35 day cycle. The observations were made from an Aerobee rocket. The 0.28-keV intensity is about 1/25 that observed during the on phase. Some evidence for X-rays above 1 keV is also present, and it is possible that the spectrum is different only in intensity from the spectrum in the on phase. The radiation may be X-rays from the vicinity of the neutron star, scattered by ionized material in the inner accretion disk, or may be thermal radiation from the inner accretion disk, or both.
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Fritz, G., Shulman, S., Friedman, H., Henry, R. C., Davidsen, A. F., Snyder, W. A.. 1976-01-01. Soft X-rays from Her X-1 during the off phase. https://ntrs.nasa.gov/citations/19760018978
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