Astrometric studies of Aldebaran, Arcturus, Vega, the Hyades, and other regions

The results of astrometric studies in the regions of Groombridge 34A, the Hyades, Aldebaran, Ross 47, BD+5 degrees 1668, 81 Cancri, BD+15 degrees 2620, Arcturus, Vega, and Ross 248 are presented. Estimates of the absolute parallax of each star are presented and a mass estimate is present for 81 Cancri. Comments include the discussion of the apparent motions of a few previously suggested planetary systems.