Abstract
MWC560 is an emission-line star catalogued1in 1943 and later described2 as an 'extraordinary symbiotic-like variable'. It was recently found3 to be undergoing a photometric and spectroscopic outburst. A dramatic change has occurred in the ultraviolet spec-trum of MWC560, so that it now closely resembles the spectrum of a nova shortly after outburst. This event, detected by the International Ultraviolet Explorer satellite, may signal a major mass-ejection episode such as presumably occurred in past centuries in the symbiotic star R Aquarii to produce the well-known bipolar nebula, and it may herald the emergence of a standard symbiotic-star emission-line spectrum in MWC560, corresponding to a change in evolutionary state.
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