Journal Article

Accurate parallax measurement toward the symbiotic star R Aquarii

Cheulhong Min, Naoko Matsumoto, Mi Kyoung Kim, Tomoya Hirota, Katsunori M. Shibata, Se-Hyung Cho, Makoto Shizugami and Mareki Honma

in Publications of the Astronomical Society of Japan

Volume 66, issue 2 Published in print April 2014 | ISSN: 0004-6264
Published online April 2014 | e-ISSN: 2053-051X | DOI: http://dx.doi.org/10.1093/pasj/psu003
Accurate parallax measurement toward the symbiotic star R Aquarii

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  • Astrometry and Celestial Mechanics
  • Astronomical Instrumentation, Methods, and Techniques
  • Stars

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Multiepoch phase-referencing VLBI (Very Long Baseline Interferometry) observations with VERA (VLBI Exploration of Radio Astrometry) were performed for the symbiotic star R Aquarii (R Aqr) from 2005 September to 2006 October. Tracing one of the v = 2, J = 1–0 SiO maser spots, we measured an annual parallax of π = 4.59 ± 0.24 mas, corresponding to a distance of [math]pc. Our result is consistent with earlier distance measurements, but yields the highest accuracy of ∼ 5% level. Applying our distance, we derived an absolute K-band magnitude of MK = −7.71 ± 0.11, which is consistent with the recent period–luminosity relation by VLBI parallax measurements for five OH-Mira variables. In addition, the expansion age of an inner nebula around R Aqr is found to be ∼ 240 yr, corresponding to about the year 1773.

Keywords: astrometry; binaries: symbiotic; instrumentation: interferometers; masers (SiO); stars: indi-vidual (R Aquarii)

Journal Article.  4372 words.  Illustrated.

Subjects: Astrometry and Celestial Mechanics ; Astronomical Instrumentation, Methods, and Techniques ; Stars

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