出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present the results of multi-epoch VERA (VLBI Exploration of Radio Astrometry) observations
of H2O masers at 22 GHz and 28SiO masers at 43 GHz in the supergiant VY Canis Majoris
(hereafter, VY CMa). We estimate the inner motion of H2O masers over 6 months and that of SiO
masers over 1 month. Using the inner motion, we calculated the statistical parallax of VY CMa.
The size of the emitting region for 28SiO masers is RSiO ∼1.81–2.89 R∗ and it is consistent with
the previous study.
