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We present spectro-polarimetric observations of several molecular linesobtained with the Submillimeter Array (SMA) toward the carbon rich AGB starIRC+10216. We have detected and mapped the linear polarization of the CO 3-2,SiS 19-18 and CS 7-6 lines. The polarization arises at a distance of ~450 AUfrom the star and is blueshifted with respect the Stokes I. The SiS 19-18polarization pattern appears to be consistent with a locally radial magneticfield configuration. However, the CO 3-2 and CS 7-6 line polarization suggestsan overall complex magnetic field morphology within the envelope. This workdemonstrates the feasibility of using spectro-polarimetric observations tocarry out tomographic imaging of the magnetic field in circumstellar envelopes.

Mapping the Linearly Polarized Spectral Line Emission around the Evolved Star IRC+10216