Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 372, Issue 4, Pages 1585-1592Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2006.10946.x
Keywords
pulsars : individual : LSI+61 degrees 303; X-rays : binaries; X-rays : individual : LSI+61 degrees 303
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LSI +61 degrees 303 is one of the few X-ray binaries with Be star companion from which both radio and high-energy gamma-ray emission have been observed. We present XMM-Newton and INTEGRAL observations which reveal variability of the X-ray spectral index of the system. The X-ray spectrum is hard (photon index Gamma similar or equal to 1.5) during the orbital phases of both high and low X-ray flux. However, the spectrum softens at the moment of transition from high to low X-ray state. The spectrum of the system in the hard X-ray band does not reveal the presence of a cut-off (or, at least a spectral break) at 10-60 keV energies, expected if the compact object is an accreting neutron star. The observed spectrum and spectral variability can be explained if the compact object in the system is a rotation-powered pulsar.
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