POLARIZED RADIO-EMISSION FROM THE MULTIPLE T-TAURI SYSTEM HD-283447

The pre-main-sequence multiple system HD 283447, one of the brightest T Tauri objects in the Taurus-Auriga complex, is a luminous nonthermal stellar radio source. It is a very young system with properties inter mediate between classical and weak-lined T Tauri stars. We report a se ries of simultaneous VLBI/VLA observations which confirm earlier evide nce for complex radio-emitting structures which are resolved only with VLBI. These structures at times achieve similar to 1/3 AU in extent, and, in one epoch, a double radio source corresponds well with the pro jected orbital separation for the inner binary. Both K stars in the cl ose binary well with the projected orbital separation for the inner bi nary. Both K stars in the close binary appear to be active radio stars . Circular and linear polarization are seen in the continuum radio emi ssion from HD 283447. The presence of linearly polarized nonthermal ra diation provides evidence for a higher-energy electron population than previously deduced from emission from any other nonthermal stellar ra dio source. (C) 1996 American Astronomical Society.