Abstract
The pre-main-sequence binary T Tauri was observed in 1991 September using a simultaneous combination of the Very Large Array (VLA) and a four-antenna Very Long Baseline Interferometry (VLBI) array operating at λ=18 cm. Strong circular polarization (25%-30%) was detected in the VLA measurements, and there was evidence for variations in both circular polarization V and total intensity I on time scales of 1 hr. VLBI measurements of T Tauri taken in parallel failed to detect any compact flux density, despite having sufficient sensitivity to measure fringe visibilities as faint as 15% of the total flux density fron the source
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