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Catching Up on State Transitions in Cygnus X-1
Moritz Boeck, Manfred Hanke, Joern Wilms +6
In 2005 February we observed Cygnus X-1 over a period of 10 days quasi-continuously with the Rossi X-ray Timing Explorer and the Ryle telescope. We present the results of the spect…
Multi-Satellite Observations of Cygnus X-1 to Study the Focused Wind and Absorption Dips
Manfred Hanke, Joern Wilms, Moritz Boeck +4
High-mass X-ray binary systems are powered by the stellar wind of their donor stars. The X-ray state of Cygnus X-1 is correlated with the properties of the wind which defines the e…
High variability in Vela X-1: giant flares and off states
Ingo Kreykenbohm, Joern Wilms, Peter Kretschmar +6
We investigate the spectral and temporal behavior of the high mass X-ray binary Vela X-1 during a phase of high activity, with special focus on the observed giant flares and off st…
Chandra X-ray spectroscopy of the focused wind in the Cygnus X-1 system. I. The non-dip spectrum in the low/hard state
Manfred Hanke, Joern Wilms, Michael A. Nowak +3
We present analyses of a 50 ks observation of the supergiant X-ray binary system Cygnus X-1/HDE 226868 taken with the Chandra High Energy Transmission Grating Spectrometer (HETGS).…
INTEGRAL long-term monitoring of the Supergiant Fast X-ray Transient XTE J1739-302
P. Blay, S. Martínez-Núñez, I. Negueruela +6
In the past few years, a new class of High Mass X-Ray Binaries (HMXRB) has been claimed to exist, the Supergiant Fast X-ray Transients (SFXT). These are X-ray binary systems with a…
The pre-outburst flare of the A 0535+26 August/September 2005 outburst
I. Caballero, A. Santangelo, P. Kretschmar +11
We study the spectral and temporal behavior of the High Mass X-ray Binary A 0535+26 during a `pre-outburst flare' which took place ~5 d before the peak of a normal (type I) outburs…