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ASCA BW SIS: Castor/YY Gem

ASCA SIS images of the Castor/YY Gem multiple star system, separated by ~70 arcsec. The bottom row shows the smoothed images, while the top row shows the result of Lucy-Richardson maximum likelihood reconstruction. Normally (middle column), YY Gem is much brighter than Castor in X-rays. However, we observed flares from YY Gem (right) and Castor (left); during the latter, Castor became brighter than YY Gem.
 
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