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Deneb

Alpha Cygni is on its way to evolve from a blue star to a red supergiant and therefore glows in white, which means all colors of the spektrum have nearly the same strength.
Thereby it increases its diameter which causes the surface temperature to fall and the color changes.

Constellation: Cygnus
Distance: 1600 light-years
Spectral class: A2
Visual magnitude: 1.25
Luminosity: 66 559 * Sun
Mass: 20 * Sun
Diameter: 116 * Sun
Radial velocity: -4.5 km/sec

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    Deneb
The brightest star is Deneb, left from it is the North America Nebula.
Photo: Ole Nielsen

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