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Pulsar Parallaxes at 5 GHz with the Very Long Baseline Array
S. Chatterjee, J. M. Cordes, W. H. T. Vlemmings +3
We present the first pulsar parallaxes measured with phase-referenced pulsar VLBI observations at 5 GHz. Due to the steep spectra of pulsars, previous astrometric measurements have…
Astrometry of the OH masers of 4 Mira stars
Wouter Vlemmings, Huib Jan van Langevelde, Phil Diamond
The OH main line masers in circumstellar shells were observed with astrometric VLBI in order to accurately determine the position of the star, as well as its motion, including the…
Circular Polarization of Circumstellar Water Masers: Magnetic Fields of AGB stars
W. H. T. Vlemmings, P. J. Diamond, H. J. van Langevelde
We present circular polarization measurements of circumstellar water masers around 2 Mira variables and 4 supergaint stars. Both an LTE and non-LTE method are used to analyze the c…