Search for activity signatures in T Thuri stars

Abstract

T Tauri stars are young, low mass, pre-main sequence stars. They exhibit a large variety of properties characteristic of earlier as well as later evolutionary phases and represent an important phase in the stellar evolutionary sequence that lies between the low luminosity sources which are deeply embedded in dust and solar type stars. T Tauri stars show uv and m excesses, and strong and variable emissions in the optical, ultraviolet and x-ray regions. The exotic behaviour of Classical T Tauri stars are primarily due to the active circumstellar disk and its interaction with the star and the properties of Weak Emission T Tauri stars are mainly attributed to the enhanced stellar activity. I have carried out a systematic study of a group of T Tauri stars using photometric, spectroscopic and polarimetric observations. I will summarize the important signatures of activity in T Tauri stars. I will also present the results of my observations and interpretations based on them.