A multiwavelength view of a classical T Tauri star CV Cha

• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2019,（1）
• 页码范围: 75-86
• 页数: 12页
• 语种: 英文
• DOI: 10.1088/1674-4527/19/1/7

摘要

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.