HEAD Division Meeting 1999, April 1999
Session 15. X-Ray Binaries
Poster, Tuesday, April 13, 1999, 8:30am-6:02pm, Gold Room

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[15.13] The BeppoSAX 0.1--10 keV short-on X-ray spectrum of Hercules X-1

T. Oosterbroek (ESTEC/ESA), A.N. Parmar (ESTEC/ESA), D. Dal Fiume (ITESRE), A. Santangelo, S. Del Sordo (IFCAI)

We present observations of the 0.1--10 keV spectrum of Her X-1 during a consecutive main-on and short-on observation in June-July 1998, obtained with the LECS and MECS instruments onboard BeppoSAX. We perform a spectral analysis on the phase-resolved spectra and find that the phase difference between the soft (reprocessed) ~0.1 keV blackbody component and the hard power-law component does not vary substantially between the main-on and short-on observation. This results is consistent with a model of a precessing accretion disk where the reprocession occurs at (or near) the inner edge of the accretion disk, since the phase difference between these components is expected to be similar half a cycle later in the 35 day phase.

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