Astron. Astrophys. 327, 215-218 (1997)

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

T. Oosterbroek , A.N. Parmar , D.D.E. Martin and U. Lammers

Astrophysics Division, Space Science Department of ESA, ESTEC, P.O. Box 299, 2200 AG Noordwijk, The Netherlands

Received 30 May 1997 / Accepted 17 June 1997

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 ( 10-100) material located at the inner edge of the accretion disk.

Key words: stars: Her X-1 neutron stars X-rays: stars

Send offprint requests to: T. Oosterbroek (toosterb@astro. estec.esa.nl)

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Contents

• 1. Introduction
• 2. Observations
  • 2.1. Phase averaged spectrum
  • 2.2. Pulse profile
  • 2.3. Pulse phase resolved spectra
• 3. Discussion
• Acknowledgements
• References

© European Southern Observatory (ESO) 1997

Online publication: April 8, 1998
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