A new orbital solution for the massive binary system HD 93403

We present a spectroscopic analysis of the early-type massive binary system HD 93403. Using high resolution optical spectra, we clearly separate the p rimary and secondary components. For the first time, we are able to provide an orbital solution for both stars. Our new orbital parameters show discre pancies with the previous solution published by Thackeray & Emerson(1969). We further discuss several spectral features of HD 93403. We finally derive qualitative constraints on the inclination of the system and we discuss it s evolutionary status and the position of both components in the Hertzsprun g-Russell diagram.