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Outbursts of WZ Sge stars/TOADs: a phenomenological comparison with soft X-ray transients
Erik Kuulkers
The outbursts of WZ Sge stars (or TOADs), are compared to those seen in the (soft) X-ray transients. Both types of outbursts exhibit strong similarities: large amplitudes, long rec…
The 1998 outburst of the X-ray transient 4U 1630-47 observed with BeppoSAX
T. Oosterbroek, A. N. Parmar, E. Kuulkers +4
We report results of five pointed BeppoSAX observations of the black hole candidate 4U 1630-47 during part of its 1998 outburst when the 2-10 keV source luminosity decreased from 2…
The eclipsing X-ray pulsar X-7 in M33
G. Dubus, P. A. Charles, K. S. Long +2
Using our extensive ROSAT X-ray observations of M33, we confirm a 3.45 day eclipse period for the Einstein source X-7 (Larson & Schulman, 1997) and discover evidence for a 0.31-s p…
Towards 4U 1630-47: a black-hole soft X-ray transient odyssey
Erik Kuulkers
4U 1630-47 is a black-hole X-ray transient with one of the shortest recurrence times. Despite its regular outburst behaviour little is known about this source. Only recently has at…
Discovery of KiloHertz Quasi-Periodic Oscillations in the Z source GX 5-1
Rudy Wijnands, Mariano Mendez, Michiel van der Klis +3
We discovered two simultaneous kHz quasi-periodic oscillations (QPOs) in the bright low-mass X-ray binary and Z source GX 5-1 with the Rossi X-ray Timing Explorer. In the X-ray col…
The Beat-Frequency Interpretation of Kilohertz QPOs in Neutron Star Low-Mass X-ray Binaries
D. Psaltis, M. Mendez, R. Wijnands +7
Pairs of quasi-periodic oscillations (QPOs) at kilohertz frequencies are a common phenomenon in several neutron-star low-mass X-ray binaries. The frequency separation of the QPO pe…
A0620-00 revisited: a black-hole transient case-study
Erik Kuulkers
For the first time we have performed a detailed study of the X-ray, optical and infra-red light curves of the 1975/1976 outburst of the famous black-hole transient A0620-00 (Nova M…
Discovery of kilohertz quasi-periodic oscillations in the Z source GX 340+0
Peter G. Jonker, Rudy Wijnands, Michiel van der Klis +3
We have discovered two simultaneous kHz quasi-periodic oscillations (QPOs) in the Z source GX 340+0 with the Rossi X-ray Timing Explorer. The X-ray hardness-intensity and color-col…
Discovery of a 57-69 Hz quasi-periodic oscillation in GX13+1
Jeroen Homan, Michiel van der Klis, Rudy Wijnands +2
We report the discovery of a quasi-periodic oscillation (QPO) at 61.0+/-1.7 Hz with the Rossi X-Ray Timing Explorer in the low-mass X-ray binary and persistently bright atoll sourc…
Discovery of KiloHertz Quasi-Periodic Oscillations in 4U 1735-44
Rudy Wijnands, Michiel van der Klis, Mariano Mendez +5
We discovered a single kHz quasi-periodic oscillation (QPO) near 1150 Hz in the Rossi X-ray Timing Explorer X-ray light curve of the low mass X-ray binary and atoll source 4U 1735-…