Magnetic field structure in the outer OH maser envelope of VX Sagittarii

Details Magnetic field structure in the outer OH maser envelope of VX Sagittarii Magnetic field structure in the outer OH maser envelope of VX Sagittarii

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...371.1012s&link_type=abstract

Astronomy and Astrophysics, v.371, p.1012-1017 (2001)

Astronomy and Astrophysics

Astrophysics

16

Masers, Polarisation, Stars: Magnetic Fields, Stars: Circumstellar Matter, Stars: Supergiants, Stars: Individual: Vx Sgr}

Scientific paper

The OH 1612 MHz maser transition from the supergiant star VX Sgr has been imaged in all Stokes parameters using MERLIN. Numerous elliptically polarised components are distributed in a roughly symmetric envelope of a size similar to that measured in total maser intensity. The polarisation vectors are generally tangential to the circumstellar envelope, indicating a globally ordered magnetic field at the distance of about 1400 au from the supergiant. It is suggested that a predominance of projected radial magnetic lines and a displacement between the red- and blue-shifted parts of the envelope can be explained with a dipole field tilted at 20-30deg to the line of sight.

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