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The BeppoSAX LECS X-ray spectrum of Hercules X-1

Research paper by T. Oosterbroek, A. N. Parmar, D. D. E. Martin, U. Lammers

Indexed on: 18 Jun '97Published on: 18 Jun '97Published in: Astrophysics



Abstract

We present 0.1-10 keV observations of Her X-1 obtained with the Low-Energy Spectrometer Concentrator instrument onboard the BeppoSAX satellite during the main on-state of the 35 day cycle. We confirm the existence of an intense 0.093 keV blackbody component and a broad emission feature at 0.94 keV. The pulse phase dependence of these components is similar, suggesting a common origin. This is most likely fluorescent excitation of moderately ionized ($\xi\sim$10--100) material located at the inner edge of the accretion disk.