Аннотация:We consider the space X_h of Hermitian matrices having staircase form and the given simple spectrum. There is a natural action of a compact torus on this space. Using generalized Toda flow, we show that X_h is a smooth manifold and its smooth type is independent of the spectrum. Morse theory is then used to show the vanishing of odd degree cohomology, so that X_h is an equivariantly formal manifold. The equivariant and ordinary cohomology rings of X_h are described using GKM theory. The main goal of this paper is to show the connection between the manifolds X_h and regular semisimple Hessenberg varieties well known in algebraic geometry. Both spaces X_h and Hessenberg varieties form wonderful families of submanifolds in the complete flag variety. There is a certain symmetry between these families, which can be generalized to other submanifolds of the flag variety.