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A VLBI polarization study of SiO masers towards VY CMa

Published online by Cambridge University Press:  01 March 2007

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:
National Center for Supercomputing Applications, University of Illinois at Urbana-Champaign, 1025 W. Clark 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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Maser emission from the SiO molecule has been widely observed in the near-circumstellar envelopes of late-type, evolved stars. VLBI images can resolve individual SiO maser spots, providing information about the kinematics and magnetic field in the extended atmospheres of these stars. This poster presents full polarization images of several SiO maser lines towards the supergiant star VY CMa. VY CMa is a particularly strong SiO maser source and allows observations of a wide range of maser transitions. We discuss implications of these observations for VY CMa morphology, polarization, and pumping models.

Keywords

stars: late-typepolarization
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 328 - 329
Copyright
Copyright © International Astronomical Union 2008

References

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