Proc. IAU volume 13, issue S336, P359-364 2017 DOI: 10.1017/s1743921317010274 View full text
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Se-Hyung Cho, Youngjoo Yun, Jaeheon Kim, Dong-Hwan Yoon, Dong-Jin Kim, Yoon Kyung Choi, Richard Dodson, María Rioja, Hiroshi Imai

Abstract: AbstractThe Korean VLBI Network (KVN) is a unique millimeter VLBI system which is consisted of three 21 m telescopes with relatively short baselines. We present the preliminary results of simultaneous monitoring observations of the 22.2 GHz H2O and 43.1/42.8/86.2/129.3 GHz SiO masers based on the KVN Key Science Project (KSP). We obtained the astrometrically registered maps of the H2O and SiO masers toward nine evolved stars using the source frequency phase referencing method (SFPR). The SFPR maps of the H2O a…

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