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 a relatively bright , partially eclipsing , and very active object .
Light curves made from Chandra /HETGS data show flaring and rotational modulation , but no eclipses .
Velocity modulation of emission lines indicates that one component dominates the X-ray emission .
The emission measure is highly structured , having three peaks .
Helium-like triplet lines give electron densities of about 3 - 18 \times 10 ^ { 10 } \mathrm { cm ^ { -3 } } .
We conclude that the corona is predominantly on the polar regions of the primary star and compact .