a1 CSIRO Astronomy and Space Science Vimiera and Pembroke Roads, Marsfield NSW 2122, Australia email: email@example.com
a2 Dept. of Astronomy, University of Illinois at Urbana-Champaign 1002 W. Green Street, Urbana, IL 61801, USA
The proximity of the SiO masers to the star, makes them a powerful tool for studying the properties of the extended stellar atmosphere. This project is a long monitoring campaign of the 43 GHz SiO masers (v=1 J=1→0) around the Mira Variable TX Cam. The target source was observed with the Very Long Baseline Array (VLBA) from the 24 th of May 1997 to the 25 th of January 2002 in bi-weekly or monthly intervals, covering 3.06 stellar cycles. The time-span and frequency of observations helped us examine the long and short-term properties of the emission and study the dynamics of the gas, the existence of shock waves and their contribution to the morphology and kinematics. Maps from each epoch were concatenated into a 112-frame movie showing the evolution of the emission around TX Cam.