ULTRAVIOLET AND RADIO OBSERVATIONS OF THE YOUNG, RAPIDLY ROTATING K0 DWARF STAR HD-197890

We present the results of UV observations taken with the International Ultraviolet Explorer (IUE) satellite and microwave observations obtai ned with the Australia Telescope during an observing campaign of the r apidly rotating K0 dwarf star HD 197890, nicknamed 'Speedy Mic'. This star was recently recognized as a powerful, transient EUV source by th e ROSAT WFC, and subsequent investigation showed it to be a ZAMS or po ssibly a PMS dwarf which may be a member of the Local Association. Our observations show it to have strong, variable UV emission lines near the 'saturation' levels. The radio observations show a level of 'quies cent' emission consistent with other rapidly rotating stars, but there is no evidence for the large flux variations that normally characteri ze the time history of such objects.