Observation of an X-Ray Outburst and Quiescent Emission from the Rs-Canum Binary HR1099

Abstract

The RS CVn binary HR1099 has been observed with the medium energy (ME) and low energy (LE) experiments on EXOSAT. X-ray emission was detected from two quiescent components with temperatures ∼4.5 × 10⁵K and ∼4 × 10⁷K, which were observed to flare during the observation. The data are compared with models of coronal behaviour. A self consistent description of the HR1099 corona is obtained which determines the pressure and extent of each component plasma. Several predictions about the morphology of the corona are made which could be tested by further observations.