The pulsed light curves of Her X-1 as observed by BeppoSAX
D. Dal Fiume, M. Orlandini, G. Cusumano, S. Del Sordo, M. Feroci, F. Frontera, T. Oosterbroek, E. Palazzi, A. N. Parmar, A. Santangelo, A. Segreto
Abstract
We report on the timing analysis of the observation of the X-ray binary pulsar Her X-1 performed during the BeppoSAX Science Verification Phase. The observation covered more that two full orbital cycles near the maximum of the main-on in the 35 day cycle of Her X-1. We present the pulse profiles from 0.1 to 100 keV. Major changes are present below 1 keV, where the appearance of a broad peak is interpreted as re-processing from the inner part of the accretion disk, and above 10 keV, where the pulse profile is less structured and the main peak is appreciably harder. The hardness ratios show complex changes with pulse phase at different energies.
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