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Cor Caroli

Alpha Canum Venaticorum is a system of a big and a small white star. Generally only the brighter of the two, Alpha-2, is called Cor Caroli.
This star has a magnetic field several hundred times stronger than that of the Sun. Therefore is has got large spots which vary its luminosity for 0.1 magnitudes.

Constellation: Canes Venatici
Distance: 110 light-years
Space between Alpha-1 and Alpha-2 Canum Venaticorum: 675 AU

Alpha-2 Canum Venaticorum

Spectral class: A0p
Visual magnitude: 2.89
Luminosity: 69.2 * Sun
Mass: 2 * Sun
Diameter: 4 * Sun
 

Alpha-1 Canum Venaticorum

Spectral class: F0
Visual magnitude: 5.61
Luminosity: 5.66 * Sun

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    Cor Caroli
Photo: ESO Online Digitized Sky Survey

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