Properties of the open cluster system

Details Properties of the open cluster system Properties of the open cluster system

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95..771j&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 95, March 1988, p. 771-784. NSF-supported research; Naturvetenskapliga Forskningsrad

Statistics

Computation

111

Galactic Structure, Metallic Stars, Open Clusters, Stellar Evolution, Ubv Spectra, Algorithms, Color-Magnitude Diagram, Computational Astrophysics, Disk Galaxies, H Beta Line

Scientific paper

A system of weigths corresponding to the precision of open cluster data is described. Using these weights, some properties of open clusters can be studied more accurately than was possible earlier. It is clear that there are three types of objects: unbound clusters, bound clusters in the thin disk, and older bound clusters. Galactic gradients of metallicity, longevity, and linear diameter are studied. Distributions at right angles to the galactic plane are discussed in the light of the different cluster types. The clumping of clusters in complexes is studied. An estimate of the selection effects influencing the present material of open cluster data is made in order to evaluate the role played by open clusters in the history of the galactic disk.

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