The hard X-ray spectrum of X Persei

D. M. Worrall, F. K. Knight, P. L. Nolan, R. E. Rothschild, A. M. Levine, F. A. Primini, W. H. G. Lewin

Research output: Contribution to journalArticle (Academic Journal)


Results of observations of 3U 0352 + 30, the source associated with the X Persei system, in the energy range 12-180 keV are reported. The measurements were made on 1978 August 22 with the UCSD/MIT High-Energy X-ray and Low-Energy Gamma-ray Experiment on HEAO 1. Data taken simultaneously in the energy range 2-50 keV indicate that, in addition to a 7 keV thermal bremsstrahlung component, there is a second component of higher energy. It is found that this higher energy component fits a power law of photon index 1.3 (+0.4, -0.5) and is pulsed at the 13.95 minute period of the lower energy component.
Original languageEnglish
JournalAstrophysical Journal
Publication statusPublished - 1 Jul 1981


  • Binary Stars
  • Bremsstrahlung
  • Neutron Stars
  • Stellar Luminosity
  • X Ray Sources
  • X Ray Spectra
  • Dwarf Stars
  • Giant Stars
  • Spectrum Analysis
  • Stellar Spectra

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    Worrall, D. M., Knight, F. K., Nolan, P. L., Rothschild, R. E., Levine, A. M., Primini, F. A., & Lewin, W. H. G. (1981). The hard X-ray spectrum of X Persei. Astrophysical Journal, 247.