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First detection of Zeeman splitting of water masers in circumstellar shells

Published online by Cambridge University Press:  03 August 2017

Wouter Vlemmings ,
Phil Diamond  and
Huib Jan van Langevelde
Wouter Vlemmings
Affiliation:
Sterrewacht Leiden, Postbus 9513, 2300 RA Leiden, The Netherlands
Phil Diamond
Affiliation:
Jodrell bank Observatory, University of Manchester, Macclesfield, Cheshire, SK11 9DL, England
Huib Jan van Langevelde
Affiliation:
Joint Institute for VLBI in Europe, Postbus 2, 7990 AA, Dwingeloo, The Netherlands

Abstract

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The strength and structure of the magnetic fields in circumstellar envelopes have been measured through polarization observations of OH and SiO masers. Here we present the first results obtained by observing the circular polarization of the H2O masers using VLBI. SiO masers are probes of the high temperature and density regime close to the central star. OH masers are found at much lower densities and temperatures, generally much further out in the circumstellar envelope. The detection of the Zeeman splitting of the (616-523) rotational transition of the H2O maser allows us to determine the magnetic field strength in the intermediate temperature and density regime.

Type
Part 4. Polarization and Magnetic Fields
Information
Symposium - International Astronomical Union , Volume 206: Cosmic Masers: From Protostars to Blackholes , 2002 , pp. 375 - 378
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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