Abstract:
We determined the cluster’s apex coordinates, studied the substructures and performed membership
analysis in the central part (34 ° x 33 °) of the open cluster M 67. We used the individual stellar apexes
method developed earlier and classical technique of proper motion diagrams in coordinate system
connected with apex. The neighbour-to-neighbour distance technique was applied to detect space
details. The membership list was corrected and some stars were excluded from the most probable mem-
bers list. The apex coordinates have been determined as: Aₒ = 132:97° ± 0:81° and Dₒ = 11:85 ° ± 0:90° .
The 2D-space star density field was analysed and high degree of inhomogeneity was found.
