Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...21116211c&link_type=abstract
American Astronomical Society, AAS Meeting #211, #162.11
Astronomy and Astrophysics
Astronomy
Scientific paper
As part of an effort to understand the origin of open clusters, we present the results from a statistical analysis of the currently observed Pleiades. Starting with a photometric catalog of the group, we employed a maximum likelihood technique to determine the mass distribution of the cluster members, including single stars and both components of the binary systems. We find that the overall binary fraction for unresolved pairs is 68%. Extrapolating to include resolved systems, this fraction climbs to about 76%, significantly higher than the accepted field-star result. The primary and secondary masses are found to be correlated, in the sense that their ratios are closer to unity than under the hypothesis of random pairing. We also mapped out the spatial variation of the cluster's projected and three-dimensional mass and number densities. We find unambiguous evidence of mass segregation, and introduce a new method for quantifying the degree of segregation.
Converse Joseph M.
Stahler Steven W.
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