The remnant of Nova Cassiopeiae 1993 (V705 Cassiopeiae)

We have detected radio emission from the remnant of V705 Cas, beginning 221 d after visual maximum. We follow the remnant from first detection while s till optically thick through the turn-over to optically thin emission, and finally confirming the absence of emission due to expansion and fading by t he end of 1998. While the emission is consistent with thermal bremsstrahlun g, as seen in most previous novae, the small-scale structure shows two ridg e-like features, which develop significantly from day 585 until our last de tection on day 1544. While the development is fairly rapid, it is also much smoother than that seen in V1974 Cyg, in that we can follow individual fea tures as they change over almost 1000 d. Our optical spectra unequivocally indicate some form of axial symmetry, as derived from the velocity structur e. This is difficult to reconcile with the observed development in the radi o images. We suggest a number of possible explanations.