Variability of Soft X-Ray Emission of Ex Hydrae Observed with Einstein Observatory

  • A. Kruszewski
  • R. Mewe
  • J. Heise
  • T. Chlebowski
  • W. van Dijk
  • R. Bakker
Conference paper
Part of the Astrophysics and Space Science Library book series (ASSL, volume 98)

Abstract

The cataclysmic variable star EX Hydrae has been observed with the High Resolution Imager (HRI) and the Imaging Proportional Counter (IPC) onboard the Einstein Observatory. The X-ray position is coincident within 3 arcsec of the optical position as measured on Schmidt survey plates. During a 15 1/2 hour observation with IPC we have searched for a modulation of the X-ray flux. Strong evidence for a 67 min period (one of two known optical periods) has been found in the energy range 0.1–3.5 keV with the IPC. The time dependence of modulations is used to discuss a model and evolutionary status of this close binary system.

Keywords

Helium Tral Spectrophotometry Lawson Bital 

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Copyright information

© D. Reidel Publishing Company 1982

Authors and Affiliations

  • A. Kruszewski
    • 1
    • 2
  • R. Mewe
    • 3
  • J. Heise
    • 3
  • T. Chlebowski
    • 4
  • W. van Dijk
    • 3
  • R. Bakker
    • 5
  1. 1.Warsaw University ObservatoryWarsawPoland
  2. 2.European Southern ObservatoryGarchingGermany
  3. 3.Space Research LaboratoryUtrechtThe Netherlands
  4. 4.Harvard-Smithsonian Center for AstrophysicsCambridgeUSA
  5. 5.Astronomical InstituteUniversity of AmsterdamAmsterdamThe Netherlands

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