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We determine the absolute dimensions of the eclipsing binary V578 Mon, adetached system of two early B-type stars (B0V + B1V, P$=$2.40848 d) in thestar-forming region NGC 2244 of the Rosette Nebula. From the light curveanalysis of 40 yr of photometry and the analysis of HERMES spectra, we findradii of $5.41\pm0.04$ Rsun and $4.29\pm 0.05$ Rsun, and temperatures of $30000\pm 500$~K and $ 25750\pm 435$ K respectively. We find that ourdisentangled component spectra for V578 Mon agree well previous spectraldisentangling from the literature. We also reconfirm the previous spectroscopicorbit of V578 Mon finding that masses of $ 14.54\pm 0.08$ Msun and $ 10.29\pm0.06$ Msun are fully compatible with the new analysis. We compare the absolutedimensions to the rotating models of the Geneva and Utrecht groups and themodels of Granada group. We find all three sets of models marginally reproducethe absolute dimensions of both stars with a common age within uncertainty forgravity-effective temperature isochrones. However - there are some apparent agediscrepancies for the corresponding mass-radius isochrones. Models with largerconvective overshoot $>0.35$ worked best. Combined with our previouslydetermined apsidal motion of $0.07089^{+0.00021}_{-0.00013}$ deg cycle$^{-1}$,we compute the internal structure constants (tidal Love number) for thenewtonian and general relativistic contribution to the apsidal motion,$\log{k_2}=-1.975\pm0.017$ and $\log{k_2}=-3.412\pm0.018$ respectively. We findthe relativistic contribution to the apsidal motion of be small $<4\%$. We findthat the prediction of $\log{k_{\rm 2,theo}}=-2.005\pm0.025$ of the Granadamodels fully agrees with our observed $\log{k_2}$.

A Strict Test of Stellar Evolution Models: The Absolute Dimensions of Massive Benchmark Eclipsing Binary V578 Mon