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On the basis of far-infrared images obtained by the Herschel SpaceObservatory, we report the discovery of a large and massive dust shell aroundthe yellow hypergiant Hen3-1379 . The nebula appears as a detached ring of 1 pcdiameter which contains 0.17 Msun of dust. We estimate the total gas mass to be7 Msun, ejected some 16000 years ago. The ring nebula is very similar tonebulae found around luminous blue variables (LBVs) except it is notphotoionized. We argued that Hen3-1379 is in a pre-LBV stage, providing directevidence that massive LBV ring nebulae can be ejected during the red supergiantphase.

A massive parsec-scale dust ring nebula around the yellow hypergiant Hen3-1379