The X-ray Variability of Capella

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

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21822801p&link_type=abstract

American Astronomical Society, AAS Meeting #218, #228.01; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

Capella is an unusual coronal source. It is an active binary with a G8 III clump giant primary and a G1 III gap giant secondary, and has an emission measure distribution that shows a strong high-temperature component. However, it does not display rapid variability signatures like flares. It has been observed at X-ray wavelengths by Chandra over a decade of calibration observations, and here we describe our analysis using multiple instruments on Chandra (205 ks with HRC-I, 581 ks with HRC-S/LETG, and 388 ks with ACIS-S/HETG) to characterize the variability at timescales ranging from minutes to hours to weeks to years. We study both the overall intensity variations as well as variations at different temperatures, as manifested in spectral lines.
We detect no flares over a megasecond of observations. But we find that variability at the 10% level is present at all temperatures and at all timescales. In particular, we find that the high temperature plasma is more strongly variable than the low temperature plasma.
This work was supported by CXC NASA contract NAS8-39073.

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