Speckle interferometry of Hipparcos link stars – III

A third list of stars which have been tested by speckle interferometry for use in the Hubble Space Telescope link between the Hipparcos astrometric reference frame and the extragalactic VLBI reference frame is presented. Structural information on angular scales of 0.15-1.2 arcsec for 34 Southern Hemisphere stars is reported from observations made with the Imperial College Speckle Interferometer mounted on the Mount Stromlo 1.9-m telescope. Twenty-four per cent of the stars (8 out of the 34) show evidence of multiplicity, in agreement with previous observations in this programme.