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| Paper: |
86 GHz VLBI Imaging of the SiO Masers in VX SGR |
| Volume: |
144, Radio Emission from Galactic and Extragalactic Compact Sources, IAU Colloquium 164 |
| Page: |
363 |
| Authors: |
Doeleman, S. S.; Lonsdale, C. J.; Greenhill, L. J. |
| Abstract: |
We 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^{-1} AU^{-1}) linear velocity gradient that can be interpreted as rigid rotation of the circumstellar envelope. |
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