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On the Origin of the Absorption Features in SS433
A. D. Barnes, J. Casares, P. A. Charles +4
We present high-resolution optical spectroscopy of the X-ray binary system SS433, obtained over a wide range of orbital phases. The spectra display numerous weak absorption feature…
The XMM-Newton/Chandra monitoring campaign of the Galactic center region: Description of the program and preliminary results
R. Wijnands, J. J. M. in 't Zand, M. Rupen +10
We present the first results of our X-ray monitoring campaign on a 1.7 square degree region centered on Sgr A* using the satellites XMM-Newton and Chandra. The purpose of this camp…
Multiband Echo Tomography of Sco X-1
T. Muñoz-Darias, I. G. Martínez-Pais, J. Casares +5
We present preliminary results of a simultaneous X-ray/optical campaign of the prototypical LMXB Sco X-1 at 1-10 Hz time resolution. Lightcurves of the high excitation Bowen/HeII e…
On the nature of two low M-dot X-ray bursters: 1RXS J170854.4-321857 and 1RXS J171824.2-402934
J. J. M. in 't Zand, R. Cornelisse, M. Mendez
We carried out Chandra observations of two low-luminosity low-mass X-ray binaries, 1RXS J170854.4-321857 and 1RXS J171824.2-402934, for which previously single X-ray bursts had bee…
Detection and analysis of a new INTEGRAL hard X-ray transient, IGR J17285-2922
E. J. Barlow, A. J. Bird, D. J. Clark +10
We present the transient nature of INTEGRAL source IGR J17285-2922, identified from a single period of activity during an IBIS/ISGRI Galactic Centre Deep Exposure in September 2003…
Periodic Variability During the X-ray Decline of 4U 1636-53
I. C. Shih, A. J. Bird, P. A. Charles +2
We report the onset of a large amplitude, statistically significant periodicity (~46 d) in the RXTE/ASM data of the prototype X-ray burster 4U 1636-53, the X-ray flux of which has…