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We present the results of a search for UV and optical counterparts of the SSS population in M 31. We find that out of the 56 sources we included in our search, 16 are associated with regions of ongoing or recent star formation. We discuss two particularly interesting sources that are identified optically as early type stars, one of which displayed long term X‐ray evolution similar to that observed in classical novae. We discuss the physical origin of supersoft X‐rays in these and the other SSS in young regions, and their possible link to the so‐called “prompt” component of the Type Ia supernova population (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

SSS in young stellar populations and the “prompt” component of Type Ia supernovae