Journal
ASTRONOMY & ASTROPHYSICS
Volume 416, Issue 1, Pages 125-136Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20034238
Keywords
astrometry; stars : low mass, brown dwarfs; Galaxy : open clusters and associations : individual : Alpha Per, Pleiades
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In this paper we present surveys of two open clusters using photometry and accurate astrometry from the SuperCOSMOS microdensitometer. These use plates taken by the Palomar Oschin Schmidt Telescope giving a wide field (5degrees from the cluster centre in both cases), accurate positions and a long time baseline for the proper motions. Distribution functions are fitted to proper motion vector point diagrams yielding formal membership probabilities. Luminosity and mass functions are then produced along with a catalogue of high probability members. Background star contamination limited the depth of the study of Alpha Per to R = 18. Due to this the mass function found for this cluster could only be fitted with a power law (xi(m) = m(-o)) with alpha = 0.86(-0.19)(+0.14). However with the better seperation of the Pleiades' cluster proper motion from the field population results were obtained down to R = 21. As the mass function produced for this cluster extends to lower masses it is possible to see the gradient becoming increasingly shallow. This mass function is well fitted by a log normal distribution.
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