TeV gamma-rays from accreting binary systems. [Vel X-1; Cen X-3; AE Aqr]

Evidence is presented that Vela X-1 emits steady pulsed emission at the X-ray period. Another X-ray binary, Cen X-3, also show evidence for steady, pulsed emission at the expected X-ray period, but this emission only occurs in the orbital phase range between 0.5 and 0.75. In both sources the emission occur at a period compatible with the X-ray period, although slightly shifted. The white dwarf in the cataclysm variable, AE Aqr, shows steady, pulsed emission at the known spin period, and in phase with both the X-ray and optical emission, indicating the production of gamma-rays close to the white dwarf.