Proper motions of Hipparcos stars in two plate areas

Abstract

Using the ACT reference catalogue as preliminary reference we have reduced 31 exposures on 15 plates in two areas taken with the 40-cm refractor of our Observatory. Using the central overlapping technique and an iterative procedure we have derived high-precision positions and proper motions for 54 stars, including 16 Hipparcos stars. For the latter, the mean standard errors, in right ascension and declination, are 0.70 and 0.59 mas/yr in proper motion, and 10.5 and 7.5 mas in position.