STATIONARY AXION DILATON SOLUTIONS AND SUPERSYMMETRY/

We present a new set of supersymmetric stationary solutions of pure N = 4, d = 4 supergravity (and, hence, of low-energy effective string th eory) that generalize (and include) the Israel-Wilson-Pejes solutions of Einstein-Maxwell theory. All solutions have 1/4 of the supersymmetr ies unbroken and some have 1/2. The full solution is determined by two arbitrary complex harmonic functions H-1,H-2 which transform as a dou blet under SL(2,R) S duality and N complex constants k((n)) that trans form as an SO(N) vector. This set of solutions is, then, manifestly du ality invariant. When the harmonic functions are chosen to have only o ne pole, all the general resulting point-like objects have supersymmet ric rotating asymptotically Taub-NUT metrics with 1/2 or 1/4 of the su persymmetries unbroken. The static, asymptotically Bat metrics describ e supersymmetric extreme black holes. Only those breaking 3/4 of the s upersymmetries have regular horizons. The stationary asymptotically fl at metrics do not describe black holes when the angular momentum does not vanish, even in the case in which 3/4 of the supersymmetries are b roken.