  UVMag is a medium-size space telescope equipped with a high-resolution
spectropolarimeter working in the UV and visible domains. It will be proposed
to ESA for a future M mission. It will allow scientists to study all types of
stars as well as e.g. exoplanets and the interstellar medium. It will be
particularly useful for massive stars, since their spectral energy distribution
peaks in the UV. UVMag will allow us to study massive stars and their
circumstellar environment (in particular the stellar wind) spectroscopically in
great details. Moreover, with UVMag's polarimetric capabilities we will be
able, for the first time, to measure the magnetic field of massive stars
simultaneously at the stellar surface and in the wind lines, i.e. to completely
map their magnetosphere.
