Two Types of Pulsar

Abstract

Some arguments for the subdivision of pulsars into two classes are considered: (i) short-period pulsars described by Smith's (1973) model and (ii) long-period pulsars for which the hollow-cone model is valid. The data for PSR 1937 + 21 (P = 1·56 ms) are in good agreement with this conception, this pulsar being a typical representative of the first group of pulsars.