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This work describes a procedure to derive several fundamental parameters suchas the effective temperature, surface gravity, equatorial rotational velocityand microturbulent velocity. In this work, we have written a numericalprocedure in Python which finds the best fit between a grid of syntheticspectra and the observed spectra by minimizing a standard chi-square. LTE modelatmospheres were calculated using the ATLAS9 code and were used as inputs tothe spectrum synthesis code SYNSPEC48 in order to compute a large grid ofsynthetic Balmer line profiles. This new procedure has been applied to a largenumber of new observations (GIRAFFE spectra) of B and A stars members of theyoung open cluster NGC3293. These observations are part of the GAIA ESO Survey.Takeda's procedure was also used to derive rotational velocities andmicroturbulent velocities. The results have been compared to previousdeterminations by other authors and are found to agree with them. As a firstresult, we concluded that using this procedure, an accuracy of +-200 K could beachieved in effective temperature and +-0.2 dex in surface gravities.

Automated procedure to derive fundamental parameters of B and A stars: Application to the young cluster NGC 3293