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The rapid X-ray variability of V4641 Sagittarii (SAX J1819.3-2525 = XTE J1819-254)
Rudy Wijnands, Michiel van der Klis
We report on the rapid X-ray variability of the variable star and X-ray transient V4641 Sagittarii (SAX J1819.3-2525; XTE J1819-254) as observed on 15 Sept. 1999 by the proportiona…
X-ray timing behaviour of Cygnus X-2 at low intensities
Erik Kuulkers, Rudy Wijnands, Michiel van der Klis
It is known that the overall (mean) intensity of the low-mass X-ray binary Cyg X-2 varies on time scales from a day to months, independently from the variations on time scales of h…
The discovery of a 7-14 Hz Quasi-Periodic Oscillation in the X-ray Transient XTE J1806-246
Rudy Wijnands, Michiel van der Klis
We have studied the correlated X-ray spectral and X-ray timing behavior of the X-ray transient XTE J1806-246 using data obtained with the proportional counter array onboard the Ros…