AstroSat investigation of X-ray flares on two active K-M systems: CC Eri and AB Dor

Abstract

We present an X-ray and UV investigation of five X-ray flares detected on two active systems, CC Eri and AB Dor, using the AstroSat observatory. The peak X-ray luminosities of the flares in the 0.3$-$7.0 keV band are found to be within 10${}^{31-33}$ erg s${}^{-1}$. Preliminary spectral analysis indicates the presence of three and four-temperature corona for CC Eri and AB Dor, respectively, where the highest temperature is found to vary with flare. The flare temperatures peaked at 51$-$59 MK for CC Eri and 29$-$44 MK for AB Dor. The peak emission measures of the flaring loops are estimated to be $\sim$10${}^{54}$ for CC Eri and $\sim$10${}^{55}$ cm${}^{-3}$ for AB Dor. Global metallic abundances were also found to increase during flares.

8 pages, 3 figures, Accepted for publication in Bulletin de la Société Royale des Sciences de Liège (BSRSL)