VLBA observations of SiO masers: Arguments in favor of radiative pumping mechanisms

J. F. Desmurs, V. Bujarrabal, F. Colomer +1

We have performed VLBA observations of the SiO v=1 and v=2 J=1-0 masers in two AGB stars, TX Cam and IRC +10011. We confirm the ring-like spatial distribution, previously found in…