Abstract:
We present, for the first time, an analysis of seven intense
X-ray flares observed from six stars (LAV 796, LAV 1174, SHM2002
3734, 2MASS 02191082+5707324, V553 Car, V557 Car). These stars
are located in the region of young open star clusters NGC 869 and IC
2602. These flares detected in the XMM-Newton data show a rapid rise
(10–40 min) and a slow decay (20–90 min). The X-ray luminosities dur-
ing the flares in the energy band 0.3–7.5 keV are in the range of 10²⁹.⁹
to 10³¹.⁷ erg s‐¹ . The strongest flare was observed with the ratio ∼13
for count rates at peak of the flare to the quiescent intensity. The maxi-
mum temperature during the flares has been found to be ∼100 MK. The
semi-loop lengths for the flaring loops are estimated to be of the order of
10¹⁰ cm. The physical parameters of the flaring structure, the peak den-
sity, pressure and minimum magnetic field required to confine the plasma
have been derived and found to be consistent with flares from pre-main
sequence stars in the Orion and the Taurus-Auriga-Perseus region.
