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   52018
   We propose to observe the highly eccentric colliding-wind binary Iota
   Orionis (O9 III + B0 III) at two key orbital phases, for a total of 100
   ksec. The goal is to investigate, in depth, colliding-wind physics in
   line-driven winds. Near periastron in this system the orientation is
   changing rapidly, so a long exposure offers critical insight into the
   wind-collision geometry. The effects of tidally enhanced mass loss can
   also be seen at this phase. Of additional interest is the potential for
   sudden radiative braking to set in at some critical separation. A
   complementary observation at apastron will allow a detailed comparison
   at the two orbital extremes, and test our understanding of the behavior
   of colliding winds as a function of binary separation and viewing
   angle.
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