Short Timescale Coronal Variability in Capella

Details Short Timescale Coronal Variability in Capella Short Timescale Coronal Variability in Capella

2007-09-19

arxiv.org/abs/0709.3093v1

Astronomy and Astrophysics

Astrophysics

submitted to The Astronomical Journal

Scientific paper

We analyze 205 ks of imaging data of the active binary, Capella, obtained with the Chandra High Resolution Camera Imager (HRC-I) to determine whether Capella shows any variability at timescales < 50 ks. We find that a clear signal for variability is present for timescales < 20 ks, and that the light curves show evidence for excess fluctuation over that expected from a purely Poisson process. This overdispersion is consistent with variability at the 2-7% level, and suggests that the coronae on the binary components of Capella are composed of low-density plasma and low-lying loops.

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