86 GHz VLBI Imaging of the SiO Masers in VX Sgr

S. S. Doeleman, C. J. Lonsdale, L. J. Greenhill
1998 International Astronomical Union Colloquium  
AbstractWe present the first 86 GHz spectral line VLBI map. Strong SiO masers in the late type star VX Sgr are mapped with a relative astrometry of 0.15 mas revealing an irregular ring of maser emission that echos structure seen at 43 GHz. A surprising feature of this map is the detection of a large (0.5 km s−1AU−1) linear velocity gradient that can be interpreted as rigid rotation of the circumstellar envelope.
doi:10.1017/s0252921100045942 fatcat:f2osy26hxfgbpnof5jfv2aou7u