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M. T. Wolff, K. S. Wood, P. S. Ray, D. Chakrabarty, R. M. Bandyopadhyay, G. Fritz, P. Hertz, M. P. Kowalski, M. N. Lovellette, D. Yentis (E. O. Hulburt Center for Space Research, Naval Research Laboratory), P. Saz Parkinson, E. Bloom, W. Focke, B. Giebels, G. Godfrey, K.T. Reilly, G. Shabad (Stanford Linear Accelerator Center, Stanford University), J. Scargle (NASA/ Ames Research Center), USA Experiment Science Working Group
SMC X-1 is a short period (0.71 s) X-ray pulsar accreting from a B0 supergiant companion. It is unusual in that it has exhibited one probable Type II X-ray burst, possibly putting it in a class with GRO J1744-28 (`` The Bursting Pulsar''). It has also shown smooth spinup since its discovery, despite varying in luminosity from 1037 to 1039 erg/s. It is also eclipsing and and orbital period derivative has been measured.
We present timing observations of SMC X-1 made with the USA Experiment on ARGOS made between 1999 October and 2000 February (covering more than two of the 60-day disk precession periods), combined with archival data from RXTE. We study the torque variations observed and examine the power density spectrum in the range 1 to 15 keV.
Basic research in X-ray Astronomy at the Naval Research Laboratory is supported by NRL/ONR. Work on USA at SLAC is supported by Department of Energy contract DE-AC03-76SF00515.
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