SF2A-2011: Semaine de l'Astrophysique Francaise Alecian, G. ; Belkacem, K. ; Samadi, R. ; Valls-Gabaud, D. Abstract Publication: SF2A-2011: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Pub Date: December 2011 Bibcode: 2011sf2a.conf.....A