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Spectral transformation of the unusual variable star MWC560 to resemble a nova

Sonneborn, George; Maran, Stephen P.; Oliversen, Ronald J. +1 more

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 spectru…

Detection of a stellar flare at extreme ultraviolet wavelengths

Bromage, G. E.; Barstow, M. A.; González-Riestra, R. +3 more

THE transition region between stellar chromospheres and coronae contains plasma at temperatures of 10⁵-10⁶ K, radiating predominantly at extreme ultraviolet (EUV) wavelengths (60-1,000 Å 0.012-0.2 keV). To understand the energy transport processes that maintain the corona, radiative losses from this region must be studied, pa…