000002727 001__ 2727
000002727 005__ 20160701171709.0
000002727 037__ $$aASTROimport-884
000002727 100__ $$aAydi, E.
000002727 245__ $$aAutomated procedure to derive fundamental parameters of B and A stars: Application to the young cluster NGC 3293
000002727 260__ $$c2014
000002727 520__ $$aThis work describes a procedure to derive several fundamental parameters such as the effective temperature, surface gravity, equatorial rotational velocity and microturbulent velocity. In this work, we have written a numerical procedure in Python which finds the best fit between a grid of synthetic spectra and the observed spectra by minimizing a standard chi-square. LTE model atmospheres were calculated using the ATLAS9 code and were used as inputs to the spectrum synthesis code SYNSPEC48 in order to compute a large grid of synthetic Balmer line profiles. This new procedure has been applied to a large number of new observations (GIRAFFE spectra) of B and A stars members of the young open cluster NGC3293. These observations are part of the GAIA ESO Survey. Takeda's procedure was also used to derive rotational velocities and microturbulent velocities. The results have been compared to previous determinations by other authors and are found to agree with them. As a first result, we concluded that using this procedure, an accuracy of ± 200 K could be achieved in effective temperature and ± 0.2 dex in surface gravities.
000002727 700__ $$a Gebran, M.
000002727 700__ $$a Monier, R.
000002727 700__ $$a Royer, F.
000002727 700__ $$a Lobel, A.
000002727 700__ $$a Blomme, R.
000002727 773__ $$c451-455$$pSF2A-2014: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics$$y2014
000002727 85642 $$ahttp://esoads.eso.org/abs/2014sf2a.conf..451A
000002727 905__ $$apublished in
000002727 980__ $$aNONREF