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This paper presents a detailed analysis of the light and radial velocitycurves of the semi-detached eclipsing binary system OGLE-LMC-ECL-09937. Thesystem is composed of a hot, massive and luminous primary star of a late-Ospectral type, and a more evolved, but less massive and luminous secondary,implying an Algol-type system that underwent a mass transfer episode. We derivemasses of 21.04 +/- 0.34 M_Sun and 7.61 +/- 0.09 M_Sun and radii of 9.93 +/-0.06 R_Sun and 9.18 +/- 0.04 R_Sun, for the primary and the secondarycomponent, respectively, which make it the most massive known Algol-type systemwith masses and radii of the components measured with <2% accuracy.Consequently, the parameters of OGLE-LMC-ECL-09937 provide an importantcontribution to the sparsely populated high-mass end of the stellar massdistribution, and an interesting object for stellar evolution studies, being apossible progenitor of a binary system composed of two neutron stars.

OGLE-LMC-ECL-09937: The Most Massive Algol-Type Binary System With A Mass Measurement Accurate to 2%