70 citations · 123 across the 7 of their papers we have counts for
4 papers · 1 filter
Correlated X-ray and Optical Variability in V404 Cyg in Quiescence
R. I. Hynes, P. A. Charles, M. R. Garcia +11
We report simultaneous X-ray and optical observations of V404 Cyg in quiescence. The X-ray flux varied dramatically by a factor of >20 during a 60ks observation. X-ray variations w…
Long-term X-ray variability and state transition of GX 339-4
A. K. H. Kong, P. A. Charles, E. Kuulkers +1
With extensive monitoring data spanning over 30 years from Vela 5B, Ariel 5, Ginga, Compton Gamma Ray Observatory, Rossi X-ray Timing Explorer and BeppoSAX, we find evidence for lo…
Irradiation of the secondary star in X-ray Nova Scorpii 1994 (=GRO J1655--40)
T. Shahbaz, P. Groot, S. N. Phillips +3
We have obtained intermediate resolution optical spectra of the black-hole candidate Nova Sco 1994 in June 1996, when the source was in an X-ray/optical active state (R~15.05). We…
The rotation speed of the companion star in V395 Car (=2S0921--630)
T. Shahbaz, E. Kuulkers, P. A. Charles +3
We have obtained high resolution optical spectroscopy of the accretion disc corona source 2S0921--630 (=V395 Car) that constrains the spectral type of the companion star to be most…