Eclipsing binary systems (EBS) are commonly studied in astrophysics as a unique source of information, that does not depend on complex models, for the accurate determination of stellar masses and radii from fundamental laws. The absolute parameters of the EBS are obtained far more precisely than those determined by other methods (pulsating stars, clusters studies, interferometry, etc).
In the present work the triple system V906 Sco was analysed both spectroscopically and photometrically, using high quality and unpublished data. New ephemeris were obtained and the third light contribution was estimated.
The reduction of the spectroscopic data was done with computer programs developed by the Astrophysics Group at UFMG, the data being obtained at the LNA (National Astrophysics Laboratory). The data base used for the wavelength calibration of the spectra was created by the author in a previous work. The photometric data, obtained at ESO (European Southern Observatory) was analysed, for the first time, with allowance for third light.
The physical parameters of the system were very accurately determined, the errors being of < 2% for masses and radii. Due to that it was possible to test stellar evolutionary models and confirm that V906 Sco is a member of the open cluster M7.
By establising the system's age, we also obtained the age of M7, which agrees with many published determinations made with different methods by various authors. The accuracy of the results enhance the system importance, as it clearly shows the necessity of non-standard evolutionary models, which include mechanisms such as overshooting in order to extend the Main Sequence life of the more massive stars.