Abstract
La nature variable et complexe des etoiles T Tauri necessite un traitement theorique propre pour leurs atmospheres, avec une information spectrale pour plusieurs resolutions et longueurs d'ondes. L'ensemble des donnees recueillies a permis d'obtenir les types spectraux, corrections de rougissement, vitesses radiales d'etoiles T Tauri. D'apres les positions dans le diagramme HR, on determine la masse, rayon, et gravite de surface pour chaque objet
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