École Nationale Supérieure de
Techniques Avancées

Résumé

Star-disk accretion process remains partly misunderstood. [9] hinted a possible characterisation of such an accretion looking at correlation of absorption components of Halpha line fitting for edge-on young star AA Tau. Such behaviour was also registered for LkCa 15 [4] but both studies failed at fully described the phenomenon because of their shortness. Based on a 6-month spectral observation campaign, this study aims at confirming and characterising such a correlation. We find a telling correlation with period of about 17.9 days for both components. Their evolution looks erratic with main periods of variations smaller than ±20km.s−1.day−1 and sparse high fluctuation epochs.