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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