Accurate parallax measurement toward the symbiotic star R Aquarii
Accurate parallax measurement toward the symbiotic star R Aquarii
Multi-epoch 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 September 2005 to Oct 2006. Tracing one of the $v=2$, $J=1-0$ SiO maser spots, we measured an annual parallax of $\pi = 4.59\pm0.24$ mas, …