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Acrux

The brightest star of the Southern Cross is a system of three blue stars. The most luminous of these, Alpha 1.1, hast just started to evolve to a red supergiant. This process will last some hundred thousand or million years.
All three stars have temperatures between 26 000 and 28 000 kelvin.

Constellation: Crux
Distance: 321 light-years
Space between Acrux Alpha 1.1 and Alpha 1.2: 1 AU
Orbit period of Acrux Alpha 1.1 and Alpha 1.2: 76 days
Space between Acrux Alpha 1 and Alpha 2: Min. 430 AU
Orbit period of Acrux Alpha 1 and Alpha 2: 1500 years

Acrux Alpha 1.1

Spectral class: B0
Visual magnitude: 1.33
Luminosity: 25 000 * Sun
Mass: 14 * Sun
 

Acrux Alpha 1.2

Spectral class: B0


Mass: 10 * Sun
 

Acrux Alpha 2

Spectral class: B1
Visual magnitude: 1.73
Luminosity: 16 000 * Sun
Mass: 13 * Sun

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    Southern Cross
To the left ist the Southern Cross, the bottom star is Acrux, the left is Becrux. In the background is a part of the Milky Way with the Coalsack Nebula.
Photo: Southern Astronomical Society

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