TeV gamma‐rays from accreting binary systems

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.