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More than 50 years after the dawn of X-ray astronomy, the dynamicalparameters of the prototypical X-ray binary Sco X-1 are still unknown. Wecombine a Monte Carlo analysis, which includes all the previously known orbitalparameters of the system, along with the K-correction to set dynamicalconstraints to the masses of the compact object (M1<1.73 Msun) and thecompanion star (0.28 Msun<M2<0.70 Msun). For the case of a canonical neutronstar mass of M1= 1.4 Msun, the orbital inclination is found to be lower than 40degree. We also present the best near-infrared spectrum of the source to date.There is no evidence of donor star features on it, but we are able to constrainthe veiling factor as a function of the spectral type of the secondary star.The combination of both techniques restricts the spectral type of the donor tobe later than K4 and luminosity class IV. It also constrains the contributionof the companion light to the infrared emission of Sco X-1 to be lower than 33percent. This implies that the accretion related luminosity of the system inthe K band is larger than 4 x 10E35 erg/s.

Mass constraints to Sco X-1 from Bowen flourescence and deep near-infrared spectroscopy