Magnetic Fields in the envelopes of late-type stars: Circular   Polarization of H2O Masers
  We present the first circular polarization measurements of circumstellar water masers around a sample of late-type stars. These observations are used to obtain the magnetic field strength in the water maser region with both an LTE and non-LTE analysis. We find fields from a few hundred milliGauss up to a few Gauss, indicating a solar-type r^(-2) dependence of the magnetic field on the distance. No linear polarization is detected to less than 1%. 
W.H.T. Vlemmings, P.J. Diamond, H.J. van Langevelde