VLBI observations of the main line OH masers in VY Canis Majoris

Details VLBI observations of the main line OH masers in VY Canis Majoris VLBI observations of the main line OH masers in VY Canis Majoris

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...253..199b&link_type=abstract

Astrophysical Journal, Part 1, vol. 253, Feb. 1, 1982, p. 199-207.

Astronomy and Astrophysics

Astrophysics

14

Hydroxyl Emission, Infrared Stars, Interstellar Masers, Supergiant Stars, Very Long Base Interferometry, Circular Polarization, Molecular Spectra, Silicon Oxides, Stellar Magnetic Fields, Variable Stars, Water Vapor, Zeeman Effect

Scientific paper

It is pointed out that the OH/IR supergiant VY Canis Majoris is an excellent candidate for investigating the dynamics of a circumstellar cloud. VY CMa displays very strong maser emission from the SiO, H2O, and OH molecules. A series of VLBI observations of the VY CMa 1665 MHz and 1667 MHz main line OH masers was conducted to prove the inner regions of the VY CMa envelope and determine the circumstellar geometry and kinematics. These observations substantially extend the spatial and spectral resolution of previous observations. The spatial structure observed can be combined with the spectral polarization data to form a consistent picture of the kircumstellar magnetic field. The 1665 MHz Zeeman doublet permits a direct measurement of an average magnetic field strength of approximately 1 milligauss. The isolated -2.1 km/s 1667 MHz feature is 100% left circularly polarized and no spatially coincident RHC feature is seen in the 1667 MHz map.

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