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.
