Journal Article

The circumstellar magnetic field of VX Sagittarii

C. Trigilio, G. Umana and R. J. Cohen

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 297, issue 2, pages 497-501
Published in print June 1998 | ISSN: 0035-8711
Published online June 1998 | e-ISSN: 1365-2966 | DOI:
The circumstellar magnetic field of VX Sagittarii

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OH maser emission from the circumstellar envelope of the M-type supergiant VX Sagittarii has been mapped at 1612 MHz in both hands of circular polarization using MERLIN, with an angular resolution of 0.4 arcsec and a velocity resolution of 0.3 km s−1. Four likely Zeeman pairs of maser components are identified, each with a similar Zeeman splitting. The inferred magnetic field strength is approximately −1 mG in each case, with the field directed towards us. The Zeeman components lie ∼ 1400 au from the star. The data lend support to the dipole magnetic field model which has recently been suggested for this circumstellar envelope.

Keywords: magnetic fields; masers; circumstellar matter; stars: individual: VX Sgr; infrared: stars; radio lines: stars

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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