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Water Maser Emission Around Low/Intermediate Mass Evolved Stars

Published online by Cambridge University Press:  24 July 2012

M. L. Leal-Ferreira ,
W. H. T. Vlemmings ,
P. J. Diamond ,
A. Kemball ,
N. Amiri  and
J.-F. Desmurs
M. L. Leal-Ferreira
Affiliation:
Argelander Institute für Astronomie, Uni-Bonn, Auf dem Hügel 71, 53121 Bonn, Germany email: ferreira@astro.uni-bonn.de
W. H. T. Vlemmings
Affiliation:
OSO (Sweden)
P. J. Diamond
Affiliation:
JBCA (UK)
A. Kemball
Affiliation:
University of Illinois (USA)
N. Amiri
Affiliation:
JIVE (Netherlands) Leiden Observatory (Netherlands)
J.-F. Desmurs
Affiliation:
OAN (Spain)
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Abstract

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We present results of Very Long Baseline Array (VLBA) polarimetric 22 GHz H2O maser observations of a number of low/intermediate mass evolved stars. We observed 3 Miras (Ap Lyn, IK Tau and IRC+60370), 1 semi-regular variable (RT Vir) and 1 pPN (OH231.8+4.2). Circular polarization is detected in the H2O maser region of OH231.8+4.2 and we infer a magnetic field of |B||| = ~45 mG. This implies an extrapolated magnetic field of ~2.5 G on the surface of the central star. The preliminary results on RT Vir and IRC+60370 also indicate the first detection of weak H2O maser linear polarization.

Keywords

masersmagnetic fieldspolarizationstars: AGB and post-AGB
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S287: Cosmic Masers - from OH to H0 , January 2012 , pp. 79 - 80
Copyright
Copyright © International Astronomical Union 2012

References

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