Searching For Evidence of Magnetospheric Interaction in Epsilon Lupi

Epsilon Lupi is the only close binary star system where both massivemainsequence components have strong magnetic fields. Thus it is a naturallaboratory for the study of the influence of magnetism on binarity. We havediscovered radio emissions from this system that revealed doublepeakedenhancement near the periastron phase, as well as pseudocyclic variationsacross the orbital phase. The doublepeak enhancement is likely to be an effectof magnetospheric interaction. If this scenario is correct, one would alsoexpect Xray counterparts to the radio enhancements in the form of enhancementin the Xray light curve at similar phases. Thus we request 55 ks of XMMNewtontime to search for the evidence of magnetospheric interaction and orbital variability in our unique target. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]