The Bulletin of The Korean Astronomical Society (천문학회보)
- Volume 40 Issue 2
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- Pages.40.3-41
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- 2015
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- 1226-2692(pISSN)
Simultaneous source frequency phase referencing observations of H2O and SiO masers toward VX Sgr
- Yoon, Dong-Hwan (Department of Physics and Astronomy, Seoul National University) ;
- Cho, Se-Hyung (Korea Astronomy and Space Science Institute) ;
- Yun, Young-Joo (Korea Astronomy and Space Science Institute) ;
- Choi, Yoon Kyung (Korea Astronomy and Space Science Institute) ;
- Kim, Jaeheon (Korea Astronomy and Space Science Institute)
- Published : 2015.10.15
Abstract
We performed simultaneous observations of H2O and SiO masers toward VX Sgr using the Korean VLBI Network (KVN) and Source Frequency Phase Referencing (SFPR) method. The observations were carried out at 5 epochs from 2014 February to 2015 June. The relative locations of the SiO with respect to the H2O maser emission were determined at two epochs by SFPR for the first time. The H2O masers show well developed asymmetric outflow features which are spread up to ~300 mas in diameter. On the other hand, the SiO masers show a ring-like structure close to the central star with ~ 30 mas diameter. The SFPR observational results at two epochs (
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