Magnetic Flux and Coronal X-ray Emission in the Late Stages of Stellar Evolution

Surface magnetic fields strengths of 210 G have been measured from the evolvedstars chi Cyg and U Mon. These measurements support the notion that largescalemagnetic fields thread the circumstellar environment of asymptotic giant branch(AGB) and postAGB stars. Magnetic fields are possible triggers of the superwindphase of AGB stars and asymmetric shaping of mass loss into the postAGB phase.The low surface magnetic field strengths imply Xray fluxes that are withinreach of deep XMM exposures. We propose XMM Xray observations of these twoevolved stars to detect their predicted low level Xray emission and establish acoronal origin for any Xray emission. Ultimately, these observations provideinsight into the evolution of stellar magnetic processes. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]