We have calculated optically thin emission-line profiles for various models of classical-nova shells. These models range from simple geometries incorporating expanding ellipsoidal shells encircled by equatorial and tropical rings or polar caps to the results of previously published hydrodynamical modelling. The effects on the profiles of different inclinations to the line of sight are also considered. A recent set of line profiles of the classical nova V705 Cas is also shown for comparison. The modelling of classical-nova shells by ellipsoids with enhanced equatorial and tropical rings is discussed.
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Gill et al. (1999) studied this question.