7-branes and higher Kaluza-Klein branes

We present and study a new chain of 10-dimensional T duality related soluti ons and their 11-dimensional parents whose existence had been predicted in the literature bused in U duality requirements in 4 dimensions. The first l ink in this chain is the S dual of the D7-brane. The next link has 6 spatia l worldvolume dimensions, it is charged w.r.t. the RR 7-form. but depends o nly on 2 transverse dimensions since the third has to be compactified in a circle and is isometric and hence is similar in this respect to the KK mono pole. The next link has 5 spatial worldvolume dimensions, it is charged w.r .t. the RR 6-form but, again, depends only on 2 transverse dimensions since the third and fourth have to be compactified in circles and are isometric and so on for the following links. All these solutions are identical when reduced over the p spatial worldvolu me dimensions and preserve a half on the available supersymmetries. Their m asses depend on the square of the radii of the isometric directions, just a s it happens for the KK monopole. We give a general map of these branes and their duality relations and show how they must appear in the supersymmetry algebra. (C) 2001 Elsevier Science B.V. All rights reserved.