53 citations · 133 across the 8 of their papers we have counts for
4 papers · 1 filter
Magnetic fields around late-type stars using water maser observations
W. H. T. Vlemmings, H. J. van Langevelde, P. J. Diamond
We present the analysis of the circular polarization, due to Zeeman splitting, of the water masers around a sample of late-type stars to determine the magnetic fields in their circ…
Hidden bipolarity in red supergiant winds
A. M. S. Richards, M. R. W. Masheder, H. J. van Langevelde +7
Many observations of late-type M stars show large near-spherical circumstellar envelopes, yet planetary nebulae and supernova remnants are frequently axisymmetric. We present VLBI…
Towards a Large Field of View Archive for the European VLBI Network
Huib Jan van Langevelde, Friso Olnon, Harro Verkouter +5
Traditionally VLBI observations focus on a small patch of sky and image typically a few 100 mas around a bright source, which is often used to self-calibrate the data. High spectra…
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…