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Important insights into the formation, structure, evolution and environmentof all types of stars can be obtained through the measurement of their windsand possible magnetospheres. However, this has hardly been done up to nowmainly because of the lack of UV instrumentation available for long periods oftime. To reach this aim, we have designed UVMag, an M-size space missionequipped with a high-resolution spectropolarimeter working in the UV andvisible spectral range. The UV domain is crucial in stellar physics as it isvery rich in atomic and molecular lines and contains most of the flux of hotstars. Moreover, covering the UV and visible spectral domains at the same timewill allow us to study the star and its environment simultaneously. Addingpolarimetric power to the spectrograph will multiply tenfold the capabilitiesof extracting information on stellar magnetospheres, winds, disks, and magneticfields. Examples of science objectives that can be reached with UVMag arepresented for pre-main sequence, main sequence and evolved stars. They willcast new light onto stellar physics by addressing many exciting and importantquestions. UVMag is currently undergoing a Research and Technology study andwill be proposed at the forthcoming ESA call for M-size missions. Thisspectropolarimeter could also be installed on a large UV and visibleobservatory (e.g. NASA's LUVOIR project) within a suite of instruments.

UVMag: stellar formation, evolution, structure and environment with space UV and visible spectropolarimetry