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Paper: Astrometry of the Red Supergiant Star VY Canis Majoris with VERA
Volume: 402, Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technologies
Page: 363
Authors: Choi, Y.K.; Hirota, T.; Honma, M.; Kobayashi, H.
Abstract: We present observational results on the red supergiant VY Canis Majoris with VERA. We have observed 22 GHz H2O masers and 43 GHz SiO masers (v = 1 and 2 J = 1 − 0) around VY CMa for 13 months. We successfully detected a parallax of 0.87 ± 0.08 mas, corresponding to 1.15+0.10−0.09 kpc of distance using H2O masers. As results of phase–referencing analyses, we have measured absolute positions for both the H2O masers and SiO masers. The proper motions of the H2O masers show the tendency of expansion.
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