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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
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)
Corresponding
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Abstract

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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2012

References

Choi, Y. K., Brunthaler, A., Menten, K. M. & Reid, M. J. 2012, this proceedingsGoogle Scholar
Desmurs, J.-F., Alcolea, J., Bujarrabal, V., Sánchez, Contreras C., et al. 2007, A&A, 468, 189Google Scholar
Kastner, J. H., Weintraub, D. A., Zuckerman, B., Becklin, E. E., et al. 1992, ApJ, 398, 552CrossRefGoogle Scholar
Leal-Ferreira, M. L., Vlemmings, W. H. T., Diamond, P. J., et al. 2012, A&A (accepted)Google Scholar
Shure, M., Sellgren, K., Jones, T. J. & Klebe, D. 1995, AJ, 109, 721CrossRefGoogle Scholar
Vlemmings, W. H. T., van Langevelde, H. J., & Diamond, P. J. 2005, A&A, 434, 1029Google Scholar
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