Magnetic Fields in the envelopes of late-type stars: Circular Polarization of H2O Masers

Details Magnetic Fields in the envelopes of late-type stars: Circular Polarization of H2O Masers Magnetic Fields in the envelopes of late-type stars: Circular Polarization of H2O Masers

2002-08-02

arxiv.org/abs/astro-ph/0208052v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figure; to be published in: Proceeding of WS on Mass-Losing Pulsating Stars and their Circumstellar Matter, Sendai,

Scientific paper

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%.

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