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Two ~35 day clocks in Her X-1: evidence for neutron star free precession
R. Staubert, D. Klochkov, K. Postnov +3
We present evidence for the existence of two ~35 day clocks in the Her X-1/HZ Her binary system. ~35 day modulations are observed 1) in the Turn-On cycles with two on- and two off-…
Giant outburst of EXO 2030+375: pulse-phase resolved analysis of INTEGRAL data
D. Klochkov, A. Santangelo, R. Staubert +1
In June-September 2006 the Be/X-ray binary EXO 2030+375 experienced the second giant outburst since its discovery. The source was shown to have a complicated pulse-averaged X-ray s…
INTEGRAL observations of the variability of OAO 1657-415
J. Barnstedt, R. Staubert, A. Santangelo +7
The Galactic Plane Scan (GPS) was one of the core observation programmes of the INTEGRAL satellite. The highly variable accreting pulsar OAO 1657-415 was frequently observed within…
INTEGRAL observations of Her X-1
D. Klochkov, R. Staubert, K. Postnov +6
Aims: We investigate the X-ray spectral and timing properties of the accreting X-ray pulsar Her X-1 observed with the INTEGRAL satellite in July-August 2005. Methods: The data anal…
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…