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Gamma Velorum, lying in the extensive but dim Gum Nebula, is an impressing triple system. The largest of the three (A) is a big blue star, orbited by a surprisingly small Wolf-Rayet star (B). This once was much bigger with up to 40 solar masses. Of these the strong stellar wind has blown away a big part, which is a hint that the star is short before the end of its life span as a supernova. Regor B is the visibly brightest Wolf-Rayet star in the sky and is extremely hot with a surface temperature of about 60 000 kelvin.
The pair is accompanied by another distant blue star (C).

Constellation: Vela
Age: 4 million years
Distance: 840 light-years
Visual magnitude A and B: 1.78
Space between Regor A and B: 1 AU
Space between Regor A/B and C: 10 000 AU
Orbit period of Regor A and B: 78.4 days

Regor A

Spectral class: O7.5
Luminosity: 200 000 * Sun
Mass: 30 * Sun

Regor B

Spectral class: WC8

Mass: 10 * Sun

Regor C

Visual magnitude: 4.2
Spectral class: B1

Back: List of big and giant stars
The Gum Nebula, right in the middle is Regor. The star has nothing to do with the nebula.
Photo: Southernskyphoto

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