MULTIWAVELENGTH PHENOMENOLOGY OF ISOLATED NEUTRON-STARS

After reviewing the multifrequency behaviour of the Isolated Neutron S tars detected so far, we analyze for each object the efficiency of con version of the star's rotational energy loss into optical, X and gamma radiation. Although the number of pulsars detected at different wavel engths is rather limited, a pattern is seen to emerge from our analysi s pointing towards the period derivative as the leading parameter to d escribe the multifrequency emission of INS. One object in particular, PSR 1509-58, stands out as archetypal for the P-dependence of its lumi nosity at different wavelengths.