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Alpha Arae

The blue star Alpha Arae, an emission star, is also known in Chinese as Tchou or Choo. It is one of the fastest rotating stars known, 50 times faster as our Sun. Its rotation speed is up to 470 km/s. Only a bit faster and it would be torn apart.
So the star is flattened at its poles. Around its equator is a large gas hull. From the poles a stellar wind with even up to 2000 km/s is ejected.

Constellation: Ara
Distance: 300 light-years
Spectral class: B2e
Visual magnitude: 2.84
Luminosity: 6000 * Sun
Mass: 10 * Sun
Diameter: 5 * Sun

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    Alpha Arae
Graphic: Anthony Meilland (Observatoire de la Côte d'Azur, France) / ESO

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