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The strange case of theta 1 Orionis

Stickland, D. J.; Lloyd, C.

We review the binary properties of the bright Orion Trapezium star theta^1 Ori A and include radial velocities from IUE in a new orbital solution; meanwhile, times of primary minimum are used to determine a new ephemeris. With these revised parameters, we strongly encourage further observations, especially a search for secondary minimum. Probably …