your ID: 0136 First Name: Monique Last Name: JOLY Affiliation: Observatoire de Paris-Meudon Title: BLR: non radiative heating in strong FeII emitters Authors: M. Joly, M.P. V¨Śron-Cetty, P. V¨Śron Topic: 5 Session: oral Abstract: The optical spectrum of Seyfert 1s reveals a great variety in the FeII emission. We investigate the formation of these lines in some strong FeII emitters and determine the physical conditions of the emission region. We show the need of a non radiative heating to account for the observations.