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 intermediate between classical and weak-lined T Tauri stars. We report a series of simultaneous VLBI/VLA observations which confirm earlier evidence 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 projected orbital separation for the inner binary. Both K stars in the close binary well with the projected orbital separation for the inner binary. Both K stars in the close binary appear to be active radio stars. Circular and linear polarization are seen in the continuum radio emission from HD 283447. The presence of linearly polarized nonthermal radiation provides evidence for a higher-energy electron population than previously deduced from emission from any other nonthermal stellar radio source. (C) 1996 American Astronomical Society.