On temperature and abundance effects during an X-ray flare on GeminorumR. Nordon1, E. Behar2 and M. Güdel3
1 Department of Physics, Technion, Haifa 32000, Israel
2 Department of Physics, Technion, Haifa 32000, Israel
3 Paul Scherrer Institut, Würenlingen & Villigen, 5232 Villigen PSI, Switzerland
(Recived 9 August 2005 / Accepted 20 September 2005 )
We compare quiescent and flare X-ray spectra of the RS CVn binary Gem obtained with the Chandra and XMM-Newton grating spectrometers. We find that in addition to an overall 25% flux increase, which can be ascribed to variations in the system's quiescence activity over the 15 months that passed between the observations, there is a hot plasma component of 3 keV that arises with the flare. The hot component is manifested primarily by emission from high charge states of Fe and by a vast continuum. The cooler ( keV) plasma remains undisturbed during the flare. We find no significant variations in the relative abundances during the flare except for a slight decrease (<30%) of O and Ne.
Key words: stars: activity -- stars: corona -- stars: flares -- stars: abundances -- stars: individual: Geminorum -- X-rays: stars
© ESO 2006