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The radio spectrum of a quiescent stellar mass black hole
Elena Gallo, Rob Fender, Rob Hynes
Observations of V404 Cyg performed with the Westerbork Synthesis Radio Telescope at four frequencies, over the interval 1.4-8.4 GHz, have provided us with the first broadband radio…
Time-Resolved Ultraviolet Spectroscopy of the SW Sex Star DW UMa: Confirmation of a Hidden White Dwarf and the UV Counterpart to Phase 0.5 Absorption Events
Christian Knigge, Sofia Araujo-Betancor, Boris T. Gaensicke +5
We present time-resolved, ultraviolet (UV) spectroscopy of the SW Sex star DW UMa in the high state. We confirm that, shortward of 1500 Å, the high-state, UV continuum level is low…
Correlated X-ray and Optical Variability in X-ray Binaries
R. I. Hynes
It has long been known that X-ray and optical/UV variability in active X-ray binaries is sometimes correlated. The expectation has been that this arises from rapid reprocessing of…
The massive neutron star or low-mass black hole in 2S0921-630
T. Shahbaz, J. Casares, C. Watson +4
We report on optical spectroscopy of the eclipsing Halo LMXB 2S0921-630, that reveals the absorption line radial velocity curve of the K0III secondary star with a semi-amplitude K_…
Indirect evidence for an active radio pulsar in the quiescent state of the transient ms pulsar SAX J1808.4-3658
S. Campana, P. D'Avanzo, J. Casares +6
Millisecond radio pulsars are neutron stars that have been spun-up by the transfer of angular momentum during the low-mass X-ray binary phase. The transition from an accretion-powe…
Optical spectroscopy of flares from the black hole X-ray transient A0620-00 in quiescence
T. Shahbaz, R. I. Hynes, P. A. Charles +5
We present a time-resolved spectrophotometric study of the optical variability in the quiescent soft X-ray transient A0620-00. Superimposed on the double-humped continuum lightcurv…
Discovery of Optical Bursts from MS1603.6+2600 = UW CrB
R. I. Hynes, E. L. Robinson, E. Jeffery
We report the discovery of several optical burst-like events from the low-mass X-ray binary MS1603.6+2600 (UW CrB). The events last for a few tens of seconds, exhibit a very fast r…
Long-term optical/infrared variability in the quiescent X-ray transient V404 Cyg
C. Zurita, J. Casares, R. I. Hynes +3
We present the results of optical and infrared photometry of the quiescent X-ray transient V404 Cyg during the period 1992-2003. The ellipsoidal modulations extracted from the most…
The Distance and Interstellar Sight Line to GX339-4
R. I. Hynes, D. Steeghs, J. Casares +2
The distance to the black hole binary GX339-4 remains a topic of debate. We examine high-resolution optical spectra of the NaD lines resolving the velocity structure along the line…
Bowen Fluorescence from Companion Stars in X-ray Binaries
J. Casares, D. Steeghs, R. I. Hynes +3
This paper will review a new technique of detecting companion stars in LMXBs and X-ray transients in outburst using the Bowen fluorescence lines at 4634-4640 Angs. These lines are…