Abstract:
Using long-term optical, ultraviolet (UV) and X-ray data, we present a study of a classical T
Tauri star CV Cha. The V -band light curve obtained from the All Sky Automated Survey (ASAS) shows
short as well as long-term variability. The short-term variability could be due to rotational modulation of
CV Cha. We derive the rotational period of 3.714 ± 0.001 d for CV Cha. UV light curves obtained from
Swift also show the variations. X-ray light curves from XMM-Newton and Swift do not show any significant
short as well as long-term variability. However, the light curve from Chandra appears to be variable, which
could be due to the emergence of flaring activities. X-ray spectra from all observations are explained well
by the single temperature plasma of 0.95 keV with X-ray luminosity of 1030.4
erg s−1
in the 0.5–7.5 keV
energy band. It appears that variability in optical and UV bands could be due to the presence of both hot
and cool spots on the surface, while X-ray emission is dominated by magnetic processes.
