Abstract Details
| Name: Subhajeet Karmakar Affiliation: Aryabhatta Research Institute of observational Sciences (ARIES), Nainital Conference ID: ASI2016_562 Title : X-ray Superflare on CC Eri Authors and Co-Authors : Jeewan C. Pandey, Aryabhatta Research Institute of observational Sciences (ARIES), Nainital Kuntal Misra, Aryabhatta Research Institute of observational Sciences (ARIES), Nainital Abstract Type : Poster Abstract Category : Stars, The Milky Way Galaxy and its neighbours Abstract : We present an in-depth study of X-ray Superflare detected on an active binary system CC Eridani with the Swift telescope. The event triggered the Burst Alert Telescope (BAT) in the hard X-ray band on 2008 October 16 at 11:22:52 UT with X-ray luminosity of 5.54 x 10^{31} erg s^{−1}at 14-50 keV energy band - a superflare, by comparison with energies of typical stellar flares on active binary systems. The peak X-ray luminosity in 0.3-10 keV energy band reached to a value of 3.01 x 10^{32} erg s^{−1}, which is 792 times more than that of the quiescent state. Spectral analysis indicates a presence of three temperature corona with first two plasma temperatures remain constant during the flaring event at ~3 and ~10 MK. The flare temperature peaked at 139.3 MK, which is ∼ 3.5 times more than the quiescent level. The peak stellar abundances was derived to be 2.02 times more than solar abundances, which is also 7.2 times more than that of the quiescent abundance observed on CC Eri. The Emission Measure followed the flare light curve and peaked at a value of 12.73 × 10^{54} cm^{−2}, which is ∼ 1383 times more than the quiescent value. We derive a loop length of 5.6 $\pm$ 0.7 $\times$ 10$^10$ cm, which is an order larger than the previously observed largest flare on CC Eri. We also investigate the emission mechanism responsible for producing the 6.4 keV Kalpha feature which was clearly visible till 200 s from the peak of the superflare. This feature is difficult to interpret using the pure fluorescence hypothesis. |