It is classified as a binary star system , consisting of a white main-sequence star of spectral type F5 IV -- V , named Procyon A , and a faint white dwarf companion of spectral type DQZ , named Procyon B .
It is actually a binary star system of a white main-sequence star of spectral type F5 IV -- V , named Procyon A , and a faint white dwarf companion of spectral type DQZ , named Procyon B .