Parallax measurement of the Galactic Mira variables with VERA

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 44...

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Bibliographic Details
Published in:Proceedings of the International Astronomical Union 2007-10, Vol.3 (S248), p.206-207
Main Authors: Nakagawa, A., Omodaka, T., Shibata, K. M., Kurayama, T., Imai, H., Kameno, S., Tsushima, M., Matsumoto, N., Matsui, M.
Format: Article
Language:English
Subjects:
Astronomy
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Summary: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.
ISSN:1743-9213
1743-9221
DOI:10.1017/S174392130801908X