Characterization of N=2 superconformal models generated by the coset space method

A characterization is made of the coset spaces (G/H) on which N=2 superconformal models can be constructed by the use of the super Kac-Moody algebra. In particular, when rank G = rank H, these spaces are precisely kaehlerian. For such a class of models it is also demonstrated that those based on irreducible hermitian symmetric spaces are singled out as those which do not admit an extra U(1) symmetry. (orig.)