Short-period binaries represent extreme cases in the generation of stellar coronae via a rotational dynamo .
Such stars are important for probing the origin and nature of coronae in the regimes of rapid rotation and activity saturation .
VW Cep ( P = 0.28 d ) is relatively bright , partially eclipsing , and very active object .
Light curves made from Chandra /HETGS data show flaring and rotational modulation , but no strong eclipses .
Emission lines are broader than instrumental , indicating emission from both binary components .
Velocity modulation of emission lines is indicative of geometric structure of the emitting plasma .