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Welcome to the East Lincolnshire Astronomy Club. The club was founded in March 2012 to bring together Amateur Astronomers from around the Lincolnshire area to enjoy the wonderful dark skies of the Lincolnshire Wolds.

                                                 Nove  (Star - TCrB)
                                         A Rare Astronomical Event.

                           Predicted between Now, May and Sept 2024

T CrB is a recurring nova in the constellation Corona Borealis, informally named the Blaze Star. Two major outbursts have been observed: in 1866 and 1946, when it rose rapidly to magnitudes 2 and 3, respectively, before slowly returning to its quiescent magnitude of 10.8. Other, smaller increases in brightness have been recorded at ultraviolet wavelengths.

Properties

The star is a spectroscopic binary, consisting of an M3 III red giant primary and a blue dwarf companion with an orbital period of 227.6 days. Matter from the red giant accretes onto the surface of the dwarf, until sufficient material has accumulated to trigger a thermonuclear explosion, which blasts the material off into space and produces the visible eruption.

T CrB has long been regarded as an anomaly among cataclysmic variables. Whereas none of the other 30-odd such systems with known binary periods have orbital periods longer than 16 hour 25 minutes, T CrB revolves in 227.5 days. All of the other systems contain low-luminosity main sequence stars, probably not much more massive than about 1 solar mass at most; while T CrB is a red giant of about 2.6 solar masses and a luminosity of more than 1000 suns. All of the other well-known cataclysmic binaries apparently contain white dwarf companions, but the mass of the blue companion star in T CrB apparently contains at least 1.9 solar mass - well above the theoretical upper limit (1.4 solar masses) for a white dwarf.

                     T crb (Blaze Star) location

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