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Classical Cepheids are key probes of both stellar astrophysics and cosmologyas standard candles and pulsating variable stars. It is important to understandCepheids in unprecedented detail in preparation for upcoming GAIA, JWST andextremely-large telescope observations. Cepheid eclipsing binary stars areideal tools for achieving this goal, however there are currently only threeknown systems. One of those systems, OGLE-LMC-CEP1812, raises new questionsabout the evolution of classical Cepheids because of an apparent agediscrepancy between the Cepheid and its red giant companion. We show that theCepheid component is actually the product of a stellar merger of two mainsequence stars that has since evolved across the Hertzsprung gap of the HRdiagram. This post-merger product appears younger than the companion, hence theapparent age discrepancy is resolved. We discuss this idea and consequences forunderstanding Cepheid evolution.

The strange evolution of the Large Magellanic Cloud Cepheid OGLE-LMC-CEP1812