The star was suspected of having a single - line spectroscopic binary companion with a period of 1,837 days — over five years (Abt and Levy, 1976, page 288), but the results were contested (Morbey and Griffin, 1987, page 349). (members.nova.org)
Star A, however, is no longer thought to have a spectroscopic binary companion with a nine - day orbital period (Morbey and Griffin, 1987; and Helmut Abt, 1987). (members.nova.org)
Astronomers can observe a star accelerating in orbit around an unseen companion, rather than a detectable binary companion star (see video above). (webbtelescope.org)