X-Ray Observations

• Discovered by HEAO-1 A2 (van Buren et al. 1980)
• 28 hour EXOSAT LE observation (Jensen et al 1986)
  • reveals 9.25m period
  • soft X-rays primarily thermal emission from WD
  • WD eclipsed
  • soft X-ray dips at phases 0.15, 0.18, 0.85
• ROSAT observations (Wheatley 1998)
  • No eclipse above 0.4 keV
  • K star: 2T coronal source
  • absorption dip at phase 0.08
• CHANDRA LETG observation January 2001
  • 88 ksec observation, 0.88 cts/sec outside eclipse.
  • Eclipse prominent.
  • 0.17 c/s from K star (20% of total flux).
  • 9.25 min (554.645 sec) WD pulsation recovered.
  • K star seems variable at the ±10% level.
  • No strong absorption events seen.
  • Consistent with weak N V absorption.
  • Spectrum not yet analyzed for absorption dips.

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