6 papers
The mass of X-Ray Nova Scorpii 1994 (=GRO J1655--40)]
T. Shahbaz, F. van der Hooft, J. Casares +2
We have obtained high and intermediate resolution optical spectra of the black-hole candidate Nova Sco 1994 in May/June 1998, when the source was in complete (X-ray) quiescence. We…
Hard X-ray lags in GRO J1719-24
F. van der Hooft, C. Kouveliotou, J. van Paradijs +7
We have used the Fourier cross spectra of GRO J1719-24, as obtained with BATSE, to estimate the phase lags between the X-ray flux variations in the 20--50 and 50--100 keV energy ba…
Hard X-ray variability of the black-hole candidate GRO J0422+32 during its 1992 outburst
F. van der Hooft, C. Kouveliotou, J. van Paradijs +7
We have studied the hard X-ray variability of the soft X-ray transient GRO J0422+32 with BATSE in the 20-100 keV energy band. Our analysis covers 180 days following the first X-ray…
Hard X-ray Lags in Cygnus X-1
D. J. Crary, M. H. Finger, C. Kouveliotou +4
We have used the Fourier cross spectra of Cyg X-1, as obtained with BATSE during a period of almost 2000 days, to estimate the phase (or time) lags between X-ray flux variations in…
Search For Rapid X-ray Variability from the Black-Hole Candidate GRO J1655-40
D. J. Crary, C. Kouveliotou, J. van Paradijs +6
We have examined fifteen days of CGRO/BATSE data, obtained during the first outburst of the black-hole candidate source GRO J1655-40, to search for rapid variability of its X-ray f…
Correlation Between BATSE Hard X-ray Spectral and Timing Properties of Cygnus X-1
D. J. Crary, C. Kouveliotou, J. van Paradijs +7
We have analyzed approximately 1100 days of Cygnus X-1 hard X-ray data obtained with BATSE to study its rapid variability. We find for the first time correlations between the slope…