The Parallax of the Red Hypergiant VX Sgr with Accurate Tropospheric Delay Calibration
The Parallax of the Red Hypergiant VX Sgr with Accurate Tropospheric Delay Calibration
Abstract We report astrometric results of VLBI phase-referencing observations of 22 GHz H 2 O masers emission toward the red hypergiant VX Sgr, one of most massive and luminous red hypergiant stars in our Galaxy, using the Very Long Baseline Array. A background source, J1820−2528, projected 4.°4 from the target …