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VLBI astrometry of the semi-regular variable star RX Bootis

Published online by Cambridge University Press:  26 February 2013

Tatsuya Kamezaki
Affiliation:
Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, Japan email: kamezaki@milkyway.sci.kagoshima-u.ac.jp
Akiharu Nakagawa
Affiliation:
Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, Japan email: kamezaki@milkyway.sci.kagoshima-u.ac.jp
Toshihiro Omodaka
Affiliation:
Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, Japan email: kamezaki@milkyway.sci.kagoshima-u.ac.jp
Toshihiro Handa
Affiliation:
Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, Japan email: kamezaki@milkyway.sci.kagoshima-u.ac.jp
Hiroshi Imai
Affiliation:
Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, Japan email: kamezaki@milkyway.sci.kagoshima-u.ac.jp
Daniel Tafoya
Affiliation:
Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, Japan email: kamezaki@milkyway.sci.kagoshima-u.ac.jp
Makoto Matsui
Affiliation:
Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, Japan email: kamezaki@milkyway.sci.kagoshima-u.ac.jp
Yoshiro Nishida
Affiliation:
Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, Japan email: kamezaki@milkyway.sci.kagoshima-u.ac.jp
Takumi Nagayama
Affiliation:
Mizusawa VLBI Observatory, Mitaka Office, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Mareki Honma
Affiliation:
Mizusawa VLBI Observatory, Mitaka Office, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Hideyuki Kobayashi
Affiliation:
Mizusawa VLBI Observatory, Mitaka Office, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Takeshi Miyaji
Affiliation:
Mizusawa VLBI Observatory, Mitaka Office, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Mine Takeuti
Affiliation:
Astronomical Institute, Tohoku University, 6-3 Aramaki, Aoba-ku, Sendai 980-8578, Japan
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Abstract

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We present a distance measurement to the semi-regular variable star RX Bootis (RX Boo). Using the VLBI Exploration of Radio Astrometry (VERA) telescope, we conducted astrometric observations of a water maser spot associated with RX Boo, as well as of the continuum reference source J1419+2706. Based on monitoring observations covering a full year, the annual parallax of RX Boo was measured at 7.31 ± 0.50 mas, corresponding to a distance of 136+10−9 pc. This distance uncertainty is smaller by a factor of two than those previously published, allowing us to determine the object's stellar properties more accurately. Using our distance, we can determine the absolute magnitude and discuss more precisely the locus of RX Boo on the period–luminosity (PL) relation. RX Boo exhibits two simultaneous pulsation periods and is located on the fundamental and first overtone Mira sequences of the PL relation. In addition, we calculated the radius and mass of the star.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2013

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