RADIO AND X-RAY STATES IN THE X-RAY BINARY SCORPIUS X-1

Radio observations of Sco X-1 were made on 1989 March 10-11 with the VLA, the WSRT, and the Australian Telescope as part of a multiwavelength campaign with the Ginga X-ray satellite, the IUE satellite, and other ground-based instruments. Two source states were detected in the radio and X-ray data, with Sco X-1 being "radio-quiet" when it was in the X-ray "flaring branch" and "radio-loud" when it was in the X-ray "normal branch," the same type of radio - X-ray correlation seen in the "Z-sources" GX 17+2 and Cyg X-2. Both radio-quiet and radio-loud states showed radio spectrum changes indicating a multicomponent radio source where the high-frequency component is variable on time scales of 2-3 hr.