Polar Exploration and Coronal Structure in the Active Binary HR 5110

Overwhelming evidence exists for the importance of polar regions in controlling stellar atmospheric structure and dynamics in active binary systems. Uncertainties about the geometry of coronal emission have made conclusions about coronal structures on such stars ambiguous. We have obtained Chandra, VLA and VLBA observations of the nearly pole‐on active binary system HR 5110 in order to investigate coronal structures without such ambiguity. The X‐ray spectra will constrain thermal coronal volumes through determinaion of electron densities; radio observations will constrain non‐thermal coronal volumes directly, and allow an estimation of the relative importance of thermal and nonthermal plasma in controlling and structuring active stellar coronae. Here we present preliminary results from the Chandra observations.