SCHMIDT PLATE SURVEY IN THE GALACTIC-CENTER AND ANTICENTRE DIRECTION - LUMINOSITY AND MASS FUNCTIONS OF OPEN CLUSTERS

The proper motions and stellar magnitudes for more than 20 000 stars d istributed in areas around eight open clusters in the directions of th e Sagittarius-Carina and Perseus spiral arms were used to determine th e cluster membership. Both spatial-kinematical and statistical criteri a were used for member selection. The luminosity functions of cluster members were constructed and used for the further data improvement. Th e safest portions of the luminosity function free both from evolved st ars and faint field star contamination were used for mass function con struction. The composite mass function was derived from the data on fi ve young clusters with log t < 8.2. A dependence of the mass function slope on the adopted input parameters (mass-luminosity relation and di stance scale) and on member selection procedure was tested. The slope was found to vary in a range from 1.36 to 1.80 for IgM/M-. between 0.3 and 1.2. A possible relation between the individual MF slopes and clu ster ages was indicated. The results are in good agreement with publis hed data.