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Astrometry of red supergiant VY Canis Majoris with VERA

Published online by Cambridge University Press:  01 October 2007

Y. K. Choi ,
T. Hirota ,
M. Honma  and
H. Kobayashi
Y. K. Choi
Affiliation:
Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan Mizusawa VERA Observatory, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan email: yoonkyung.choi@nao.ac.jp
T. Hirota
Affiliation:
Mizusawa VERA Observatory, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan email: yoonkyung.choi@nao.ac.jp
M. Honma
Affiliation:
Mizusawa VERA Observatory, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan email: yoonkyung.choi@nao.ac.jp
H. Kobayashi
Affiliation:
Mizusawa VERA Observatory, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan email: yoonkyung.choi@nao.ac.jp
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Abstract

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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 succesfully detected a parallax of 0.87 ± 0.08 mas, corresponding to the distance of 1.15 +0.10−0.09 kpc using H2O masers. As the result of phase-referencing analyses, we have measured absolute positions for both H2O masers and SiO masers. The H2O maser features show rapid expansion off the central star.

Keywords

astrometrymasersstars: distancessupergiantsstars: individual (VY CMa)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S248: A Giant Step: from Milli- to Micro-arcsecond Astrometry , October 2007 , pp. 192 - 193
Copyright
Copyright © International Astronomical Union 2008

References

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