The X-ray Variability of Capella

Details The X-ray Variability of Capella The X-ray Variability of Capella

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe.180p&link_type=abstract

Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo

Physics

Stellar Spectroscopy

Scientific paper

We have analyzed a decade of Chandra grating and imaging observations of the active binary Capella to characterize its X-ray variability at various timescales. Examining 205 ks of HRC-I imaging data taken over a time period of ˜14 months (Dec 2005 to Jan 2007), we find short term broadband variability at the 2-7% level at timescales < 20 ks. At a scale of months to years, we see variations of 3-10% in the HRC-I data. Twelve HRC-S/LETG observations taken over the ten year period since launch, for a total of ˜408 ks, indicate that the overall flux was steady until 2004 but has increased by roughly 50% since that time.In addition to examining broad band flux changes, we have also used the HRC-S/LETG observations to analyze the line emission in detail for several lines. After correcting for the broad spectrum flux increase, we determine how the line flux variability changes at different temperatures in the coronae. Variability is present at all temperatures, and we find that the high temperature plasma is more strongly variable than the low temperature plasma. We explore this variability for spectral lines of different elements at different temperatures. The emission measure structure of Capella undergoes changes more extensive than hitherto suspected.

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