HEAD 2000, November 2000
Session 24. X-Ray Binaries - Timing and Transients
Display, Wednesday, November 8, 2000, 8:00am-6:00pm, Bora Bora Ballroom

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[24.08] USA observations of Circinus X-1

P. Saz Parkinson, E. Bloom, W. Focke, B. Giebels, G. Godfrey, K.T. Reilly, G. Shabad (Stanford University), K.S. Wood, P.S. Ray, R.M. Bandyopadhyay, M.T. Wolff, G. Fritz, P. Hertz, M.P. Kowalski, M.N. Lovellette, D. Yentis (Naval Research Laboratory), J. Scargle (NASA/Ames Research Center), USA Collaboration

We present new X-ray observations of Circinus X-1 taken by the USA experiment on ARGOS. USA made observations of Circinus X-1 between the months of May and August 2000, including an intensive (70 ksec) study covering orbital phase 0.9 through 0.5.

We analyze the timing and spectral characteristics of Circinus X-1 throughout its 16.6 day orbit, monitoring the evolution of its low frequency QPO (3-10 Hz). We look at the possible correlations of the QPO frequency and rms power with the flux and energy spectrum of the source.

Basic research in X-ray Astronomy at the Naval Research Laboratory is supported by the Office of Naval Research. Work at SLAC was supported by Department of Energy contract DE-AC03-76SF00515.

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