- binary star, binary, double star - a system of two stars that revolve around each other under their mutual gravitation
--1 is a kind of star
--1 has particulars:Aldebaran; Algol; Alpha Centauri, Rigil Kent, Rigil; Altair; Antares; Epsilon Aurigae; Procyon; Rigel, Beta Orionis; Sirius, Dog Star, Canicula, Sothis; Vega