XMM-Newton's view of a RS CVn binary CF Tuc

Coronal emission exhibited by the chromospherically active binaries is important to understand the underlying mechanism. We report the X-ray spectral studies of an RS CVn source CF Tuc using XMM-Newton archival data. The light curve was found to be steady with no flaring activity and the source was in a quiescent X-ray emission state. The source spectrum can be explained by a three-component thin plasma model with temperatures similar to 0.26 keV, similar to 1.01 keV, and similar to 2.14 keV using EPIC MOS and pn data. We found that the source exhibits low abundance Z = 0.1-0.2 Z (R), well in agreement with previous studies. Based on the RGS spectral fits of OVII triplets, we estimated the temperature to be about 1-2 x 106 K and density ne = 1-2 x 1010 cm-3 of the coronal emission region during the quiescent state.