The X-ray spectrum of LSI+61 degrees 303

It had been proposed earlier that the hard X-ray and gamma-ray radiation of the Be/X-ray system LSI +61 degrees 303 could be due to inverse Compton sc attering of optical photons from the Be star by the same electron populatio n which also produces the radio emission. Recently, Apparao (2001) has calc ulated this inverse Compton emission in more detail, and predicted that the X-ray spectrum should show a break at around 20 keV. We investigated archi val RXTE data, but do not find such a break in the 2-25 keV range. The impl ications of this finding are shortly discussed.