Vol 19, No 1

A multiwavelength view of a classical T Tauri star CV Cha

Jeewan Chandra Pandey, Subhajeet Karmakar, Arti Joshi, Saurabh Sharma, Shashi Bhushan Pandey, Anil Kumar Pandey


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.


Keywords stars: activity — stars: individual (CV Cha) — stars: pre-main sequence — stars: variable: T Tauri — X-ray: stars

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