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Parallax measurement of the Galactic Mira variables with VERA

Published online by Cambridge University Press:  01 October 2007

A. Nakagawa ,
T. Omodaka ,
K. M. Shibata ,
T. Kurayama ,
H. Imai ,
S. Kameno ,
M. Tsushima ,
N. Matsumoto  and
M. Matsui
A. Nakagawa
Affiliation:
Faculty of Science, Kagoshima University, 1-21-35, Korimoto, Kagoshima, JAPAN email: nakagawa@astro.sci.kagoshima-u.ac.jp
T. Omodaka
Affiliation:
Faculty of Science, Kagoshima University, 1-21-35, Korimoto, Kagoshima, JAPAN email: nakagawa@astro.sci.kagoshima-u.ac.jp
K. M. Shibata
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, JAPAN
T. Kurayama
Affiliation:
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo, JAPAN
H. Imai
Affiliation:
Faculty of Science, Kagoshima University, 1-21-35, Korimoto, Kagoshima, JAPAN email: nakagawa@astro.sci.kagoshima-u.ac.jp
S. Kameno
Affiliation:
Faculty of Science, Kagoshima University, 1-21-35, Korimoto, Kagoshima, JAPAN email: nakagawa@astro.sci.kagoshima-u.ac.jp
M. Tsushima
Affiliation:
Faculty of Science, Kagoshima University, 1-21-35, Korimoto, Kagoshima, JAPAN email: nakagawa@astro.sci.kagoshima-u.ac.jp
N. Matsumoto
Affiliation:
Faculty of Science, Kagoshima University, 1-21-35, Korimoto, Kagoshima, JAPAN email: nakagawa@astro.sci.kagoshima-u.ac.jp
M. Matsui
Affiliation:
Faculty of Science, Kagoshima University, 1-21-35, Korimoto, Kagoshima, JAPAN email: nakagawa@astro.sci.kagoshima-u.ac.jp
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Abstract

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Parallax measurements of the Galactic Mira variables with VERA have started since 2004 to establish their Period-Luminosity (PL) relationship in the Galaxy. Multi-epoch VLBI observations of a semiregular variable S Crt yielded an accurate parallax of 2.27±0.14 mas corresponding to the distance of 441+29−24 pc. In addition to the distance, we obtained physical properties of S Crt. Temperature of the photosphere was found to be ~3000 K by fitting the infrared spectrum with a blackbody radiation. The stellar radius was obtained based on the distance, apparent magnitude, and the temperature. Internal proper motions of circularly-arranged maser spots in S Crt were detected for the first time. Observations of the other Mira variables, such as R UMa, SY Scl, AP Lyn, and WX Psc are in progress.

Keywords

astrometrymaserstechniques: high angular resolutiontechniques: interferometricstars: AGB and post-AGB
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. 206 - 207
Copyright
Copyright © International Astronomical Union 2008

References

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