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Atria

The orange-red giant Alpha Trianguli Australis, abbreviated Atria, is a hybrid star. From its surface a relatively cool stellar wind blows, but it is surrounded by a hot corona which emits X-rays. Such a corona actually doens't fit to a red giant. If the star has companions is unclear.

Constellation: Triangulum Australe
Age: 45 million years
Distance: 415 light-years
Spectral class: K2
Visual magnitude: 1.91
Luminosity: 4900 * Sun
Mass: 7 * Sun
Diameter: 130 * Sun

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03/01/2006

    Atria
Photo: ESO Online Digitized Sky Survey

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