Vol. 561
In section 8. Stellar atmospheres

Search for surface magnetic fields in Mira stars. First detection in chi Cygni

The authors present the first spectropolarimetric observations of the S-type Mira star chi Cyg, performed around its maximum light. They detected a polarimetric signal in the Stokes V spectra and established its Zeeman origin, related to a weak magnetic field present at the photospheric level and in the lower part of the stellar atmosphere. The strength of the longitudinal component is about 2-3 gauss. This is the first detection of a weak magnetic field at the stellar surface of a Mira star.