Water maser emission around low/intermediate mass evolved stars

M. L. Leal-Ferreira, W. H.T. Vlemmings, P. J. Diamond, A. Kemball, N. Amiri, J. F. Desmurs

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.

Original languageEnglish (US)
Title of host publicationCosmic Masers - from OH to H0
Number of pages2
StatePublished - Jul 2012

Publication series

NameProceedings of the International Astronomical Union
ISSN (Print)1743-9213
ISSN (Electronic)1743-9221


  • magnetic fields
  • masers
  • polarization
  • stars: AGB and post-AGB

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science


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