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The Magnetic Field in the Star-forming Region Cepheus A from Water Maser Polarization Observations
W. H. T. Vlemmings, P. J. Diamond, H. J. van Langevelde +1
We present linear and circular polarization observations of the water masers in 4 distinct regions spread over 1x2 arcseconds around the HW2 high-mass young stellar object in the C…
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…
Axial Symmetry and Rotation in the SiO Maser Shell of IK Tauri
D. A. Boboltz, P. J. Diamond
We observed v=1, J=1-0 43-GHz SiO maser emission toward the Mira variable IK Tauri (IK Tau) using the Very Long Baseline Array (VLBA). The images resulting from these observations…
The magnetic field around late-type stars revealed by the circumstellar H2O masers
W. H. T. Vlemmings, H. J. van Langevelde, P. J. Diamond
Through polarization observations, circumstellar masers are excellent probes of the magnetic field in the envelopes of late-type stars. Whereas observations of the polarization of…
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…