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Ultraviolet spectra were taken of 25 Detached Eclipsing Binaries (DEBs) withspectral types O, B, and early A with the International Ultraviolet Explorer(IUE) satellite in the 1150 to 1900 ${\AA}$ region. The spectra were comparedwith BOSZ model atmospheres (Bohlin, et al. 2017). The composite spectra of theDEBs were modeled by a combination of models representing the hot and coolcomponents, and the temperatures of the hottest components of the systems weredetermined. From these temperatures a direct Mass-Temperature relation wasobtained for stars close to the main sequence with solar metallicity for B andearly A stars: log M/Msun = -5.90 $\pm$ 0.27 + (1.56 $\pm$ 0.07) x log T Thisrelation allows a mass to be inferred for comparable stars from an ultravioletspectrum. The five chemically peculiar Am stars in the sample have larger radiithan normal A stars of the same mass.

The Mass-Temperature Relation for B and Early A Stars Based on IUE Spectra of Detached Eclipsing Binaries