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Delta Cephei

The eponym of an own class of extremely regular pulsating variables, the Delta Cepheids. The yellow-white giant has a smaller blue companion far away.

From the period length of the Delta-Cepheids can be reasoned well-defined to their mass and their luminosity. Therefore they are often used to measure the distances of other galaxies.

Constellation: Cepheus
Age: 100 million years
Distance: 890 light-years
Radial velocity: 17 km/sec
Space between Delta Cephei A and B: 12 000 AU
Orbit period of Delta Cephei A and B: 500 000 years

Delta Cephei A

Spectral class: F5 - G2
Visual magnitude: 3.61 - 4.64
Luminosity: 1500 - 3000 * Sun
Mass: 9 * Sun
Diameter: circa 40 * Sun
Pulsation period: 5.36643 days
  

Delta Cephei B

Spectral class: B7
Visual magnitude: 7.5
Luminosity: 500 * Sun
Mass: 4 * Sun

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Photo T. Credner & S. Kohle, AlltheSky.com
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