mm VLBA Observations of SiO masers: probing the close stellar environment of the PPN OH231.8+4.2

J. F. Desmurs, C. Sanchez Contreras, V. Bujarrabal +2

We present milliarsecond-resolution maps of the SiO maser emission v=1 J=2-1 (3 mm) in the bipolar post-AGB nebula OH231.8+4.2, and compare them with our previous observations of t…