2001A&A...375..145G

It had been proposed earlier that the hard X-ray and gamma-ray radiation of the Be/X-ray system LSI +61°303 could be due to inverse Compton scattering of optical photons from the Be star by the same electron population which also produces the radio emission. Recently, Apparao (2001A&A...366..865A) has calculated this inverse Compton emission in more detail, and predicted that the X-ray spectrum should show a break at around 20keV. We investigated archival RXTE data, but do not find such a break in the 2-25keV range. The implications of this finding are shortly discussed.