Multi-frequency variations of the Wolf-rayet system HD 193793 - I. Infrared, X-ray and radio observations.
van der Woerd, H.; van der Hucht, K. A.; Pollock, A. M. T.; Williams, P. M.; Florkowski, D. R.; Wamsteker, W. M.
United Kingdom, Netherlands, United States
Abstract
Observations made of the Wolf-Rayet system HD 193793 over the 1979-1989 period in the radio, X-ray, and IR regions reveal great variations in all three regimes. The most complete coverage obtained was in the IR; attention is given to an IR outburst in 1985 during which the IR flux increased by as much as an order of magnitude over the course of several weeks, before slowly declining. The X-ray luminosity is 1-2 orders of magnitude greater than that of single O or WR stars, suggesting X-ray generation by interacting winds.