Quasi-Periodic Occultation by a Precessing Accretion Disk and Other Variabilities of SMC X-1

P. S. Wojdowski, G. W. Clark, A. M. Levine +2

We have investigated the variability of the binary X-ray pulsar, SMC X-1, in data from several X-ray observatories. We confirm the ~60-day cyclic variation of the X-ray flux in the…