Variability in the X-ray Spectrum of the Stable Calibration Source Capella

Details Variability in the X-ray Spectrum of the Stable Calibration Source Capella Variability in the X-ray Spectrum of the Stable Calibration Source Capella

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hrxs.confe..32r&link_type=abstract

High Resolution X-ray Spectroscopy: towards XEUS and Con-X, Proceedings of the international workshop held at the Mullard Space

Computer Science

Scientific paper

The X-ray calibration source Capella has been extensively observed by Chandra and XMM-Newton since 1999, the year of the launches of the two satellites. We have investigated eleven X-ray spectra obtained by LETGS aboard Chandra over the last 5 years. Variability of the zeroth order count rate (lightcurve) as well as variability of the line fluxes of highly ionized iron features (FeXVIII-XXI) is established. The fluxes have been compared with measured line fluxes from EUVE observations between 1992 and 1995. A strong resemblance between variations in the period 1992-1995 and the period 2000-2005 is noticed.

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