On Temperature and Abundance Effects During an X-Ray Flare on Sigma Geminorum
Abstract
We compare quiescent and flare X-ray spectra of the RS CVn binary Sigma 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 kT_e > 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 (kT_e < 2 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.
Cite
@article{arxiv.astro-ph/0510023,
title = {On Temperature and Abundance Effects During an X-Ray Flare on Sigma Geminorum},
author = {R. Nordon and E. Behar and M. Guedel},
journal= {arXiv preprint arXiv:astro-ph/0510023},
year = {2016}
}
Comments
6 pages, 4 figures, Accepted for publication in A&A