VLBI Astrometry of the Stellar Image of U Herculis, Amplified by the 1667 OH Maser

H. J. van Langevelde, W. Vlemmings, P. J. Diamond +2

The OH 1667 MHz maser in the circumstellar shell around the Mira variable U Herculis has been observed with the NRAO Very Long Baseline Array (VLBA) at 6 epochs, spread over 4 year…