Abstract

ON-February 10 the variable star T Coronae Borealis, normally of magnitude 9, was seen to have blazed up to magnitude 3. This star had a typical nova outburst in 1866, when it was the first nova to be examined spectroscopically. Unlike other novae, its spectrum after fading was of late type with strong absorption bands of titanium oxide. During the last twenty years, its spectrum has varied considerably mainly through the appearance in varying strength of emission lines due to hydrogen, neutral and ionized helium, oxygen and nitrogen. In addition, forbidden lines of oxygen and neon commonly observed in nebulae have been observed.

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