The Cluster Analysis of Pulsar Parameters

We have used the catalogue of (Taylor et al., 1993) to investigate the problem of a classification of pulsars. Five samples have been analysed by the main components method and by methods of the cluster analysis. i) 15 pulsars with 14 known parameters P, Ṗ, W50, L (Malov et al., 1994), B, z,spectral index a, frequencies of maximum VM and minimum Vc in a spectrum (Malofeev et al., 1994), an angle between magnetic moment and rotation axis β (Malov, 1994), the transformation coefficient η = L/Ė, magnetic field near the light cylinder Blc and a maximum derivative of a position angle C = (dψ/dφ) max (Malov, 1990). ii) 130 objects with 10 parameters (the spectral characteristics α, VM, VC and the parameter C were excluded from the consideration). iii) 218 pulsars with 4 known parameters P, Ṗ, L and z. These parameters can be considered as independent variables. iv) 89 sources with the same 4 parameters. This sample consists of two subsamples: 65 pulsars with P > 1 s and 24 ones with P < 0.1 s. v) 24 pulsars with P < 0.1 s from the previous sample.