Low-mass unseen companions to two nearby red dwarfs, CC 1228 and Wolf 922

Two nearby M dwarfs, CC 1228 and Wolf 922, give indication of duplicity from plates taken with the Sproul 61-cm refractor. The unseen companions cause a perturbation for CC 1228 with P = 6.3y and for Wolf 922 with P = 1.93y. The interpretation leads to a minimum mass of 0.02 solar mass for CC 1228B and a likely range in mass of 0.13-0.20 solar mass for Wolf 922B. Accurate parallaxes yield distances of 12.2 parsecs for CC 1228 and 8.2 parsec for Wolf 922.