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Supergiant, fast, but not so transient 4U 1907+09
V. Doroshenko, A. Santangelo, L. Ducci +1
We have investigated the dipping activity observed in the high-mass X-ray binary 4U 1907+09 and shown that the source continues to pulsate in the "off" state, noting that the trans…
Outburst of GX 304-1 monitored with INTEGRAL: positive correlation between the cyclotron line energy and flux
D. Klochkov, V. Doroshenko, A. Santangelo +10
X-ray spectra of many accreting pulsars exhibit significant variations as a function of flux and thus of mass accretion rate. In some of these pulsars, the centroid energy of the c…
The hard X-ray emission of X Per
V. Doroshenko, A. Santangelo, I. Kreykenbohm +1
We present an analysis of the spectral properties of the peculiar X-ray pulsar X Per based on INTEGRAL observations. We show that the source exhibits an unusually hard spectrum and…