  We examine the effects of the engulfment of planets by giant stars on the
evolution of late-type stars. We show that the rate at which dynamo-generated
magnetic energy is being released exceeds 10% of the wind kinetic energy when
the orbital angular momentum of the engulfed planet is more than ten times the
angular momentum of the star as it leaves the main sequence. A significant
enhancement in the mass-loss rate may be expected in this case, due to the
formation of cool magnetic spots. We use the existing sample of extrasolar
planets to estimate that at least 3.5% of the evolved solar-type stars will be
significantly affected by the presence of planetary companions.
