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With an orbital period of about 3.078 days, the double-lined spectroscopicbinary HD 48099 is, still now, the only short-period O+O system known in theMon OB2 association. Even though an orbital solution has already been derivedfor this system, few information are available about the individual stars. Wepresent, in this paper, the results of a long-term spectroscopic campaign. Wederive a new orbital solution and apply a disentangling method to recover themean spectrum of each star. To improve our knowledge concerning bothcomponents, we determine their spectral classifications and their projectedrotational velocities. We also constrain the main stellar parameters of bothstars by using the CMFGEN atmosphere code and provide the wind properties forthe primary star through the study of IUE spectra. This investigation revealsthat HD 48099 is an O5.5 V((f))+O9 V binary with M_1 sin^3 i = 0.70 M_{\sun}and M_2 sin^3 i = 0.39 M_{\sun}, implying a rather low orbital inclination.This result, combined with both a large effective temperature and log g,suggests that the primary star (v sini ~ 91 km s^-1) is actually a fast rotatorwith a strongly clumped wind and a nitrogen abundance of about 8 times thesolar value.

A new investigation of the binary HD 48099