Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-11-25
Astronomy and Astrophysics
Astrophysics
13 pages, 20 Figures, Accepted for publication in Astronomy and Astrophysics
Scientific paper
10.1051/0004-6361:20034238
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 ($5^{\circ}$ 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 yeilding 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 ($\xi(m) = m^{-\alpha}$) with $\alpha=0.86^{+0.14}_{-0.19}$. 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.
Deacon Niall R.
Hambly Nigel C.
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