Abstract
Results are reported of VLBI observations of nine Rho Oph YSOs, which yield positive detections in five cases, with flux densities ranging from 1.2 to 9 mJy at 3.6 cm. In contrast, while simultaneously detected by the VLA at levels of a few mJy, the protostellar outflow source IRAS 16293 and the 'protostar' candidate YLW 15 were overresolved and undetected on the Goldstone-VLA baseline. The radio emission from the young A star VSSG 14 was measured to be circularly polarized, at a level comparable to what had previously been observed for the embedded magnetic B star S1. The brightness temperatures measured for the VLBI-detected TSOs range from about 10 exp 7 to greater than about 8 x 10 exp 7 J, unambiguously establishing that these radio sources are nonthermal, and not the result of circumstellar ionized winds as is probably the case for IRAS 16293 and YLW 15.
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