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Observational tests of SiO maser polarisation models

Published online by Cambridge University Press:  24 July 2012

L. L. Richter ,
A. J. Kemball  and
J. L. Jonas
L. L. Richter
Affiliation:
Physics and Electronics Department, Rhodes University, Grahamstown, 6140, South Africa
A. J. Kemball
Affiliation:
Physics and Electronics Department, Rhodes University, Grahamstown, 6140, South Africa Department of Astronomy, University of Illinois at Urbana-Champaign, 1002 W. Green Street, Urbana, IL 61801, USA
J. L. Jonas
Affiliation:
Physics and Electronics Department, Rhodes University, Grahamstown, 6140, South Africa
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Abstract

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SiO masers are often observed in the near-circumstellar envelope of late-type evolved stars. The polarisation of the masers can be used as a probe of the magnetic field in this region, subject to maser polarisation radiative transfer model. Two main maser polarisation models have been developed for the weak Zeeman splitting case applicable to circumstellar SiO masers. Observational tests aimed at discriminating between these models were performed at maser component level, using VLBA observations of v=1 J=1-0, v=2 J=1-0 and v=1 J=2-1 SiO masers towards the high-luminosity source VY CMa.

Keywords

stars: late-typepolarizationmasers
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S287: Cosmic Masers - from OH to H0 , January 2012 , pp. 81 - 82
Copyright
Copyright © International Astronomical Union 2012

References

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