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Min, Cheulhong; Matsumoto, Naoko; Kim, Mi Kyoung; Hirota, Tomoya; Shibata, Katsunori M; Cho, Se-Hyung; Shizugami, Makoto; Honma, Mareki
Publications of the Astronomical Society of Japan, 04/2014, Letnik: 66, Številka: 2Journal Article
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 $218_{-11}^{+12}\:$ 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 M K = −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.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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