If you had a 3-dimensional map of the coronae, it would be simple to
predict what X-ray light curve you should observe. The reverse
is harder, but possible, using a technique called deconvolution.
These images show the results of a deconvolution of the ASCA lightcurve
taken of the 2 day RS CVn binary AR Lac and compared with a similar
deconvolution of an EXOSAT lightcurve taken 9 yr earlier. The distribution of
coronal material in the system can be seen. A large structure seems to join the
two stars in the ASCA observation, which was less obvious 9 yr earlier.
This file was last modified on Tuesday, 29-May-2001 16:17:46 EDT
Michael Arida (SP Sys); email@example.com
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