It is a binary pair of two A type stars orbiting each other the Pup star (The smaller one) and the dog star the larger one. The Pup star appears about 6800 times fainter then the dog star. Compare, approximately, the temperatures, luminosities and radii of the two stars.Sirius in the Canis Major Constellation?The Sirius binary system is well documented.
http://en.wikipedia.org/wiki/Sirius
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