090441

Epsilon Lupi is the only close binary star system where both massive main-sequence components have strong magnetic fields. Thus it is a natural laboratory for the study of the influence of magnetism on binarity. We have discovered radio emissions from this system that revealed double-peaked enhancement near the periastron phase as well as pseudo-cyclic variations across the orbital phase. The double-peak enhancement is likely to be an effect of magnetospheric interaction. If this scenario is correct one would also expect X-ray counterparts to the radio enhancements in the form of enhancement in the X-ray light curve at similar phases. Thus we request 55 ks of XMM-Newton time to search for the evidence of magnetospheric interaction and orbital variability in our unique target. [truncated! Please see actual data for full text]