  We discuss the influence of the background thermal bath on the depolarization
of electrons in high-energy storage rings, and on the photon emission
associated with the spin flip. We focus, in particular, on electrons at LEP. We
show that in a certain interval of solid angles the photon emission is enhanced
several orders of magnitude because of the presence of the thermal bath.
Notwithstanding, the overall depolarization induced by the background thermal
bath at LEP conditions is much smaller than the one induced by plain
acceleration at zero-temperature and can be neglected in practical situations.
Eventually we discuss in what conditions the background thermal bath can
enhance the overall depolarization by several orders of magnitude.
