Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.126..167p&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 126, no. 1, Oct. 1986, p. 167-175.
Astronomy and Astrophysics
Astrophysics
17
Galactic Evolution, Open Clusters, Chronology, Statistical Distributions
Scientific paper
The age distribution of galactic cluster is obtained from well-observed star clusters, and it is concluded that the observed age distribution of clusters within 1000 pc is not seriously affected by the selection effects. If it is assumed that the rate of formation of clusters is constant, the observed age distributions of clusters for Trumpler's different richness classes have been obtained; and it is found that the rich clusters have longer lifetimes than the poor clusters. The lifetimes of clusters for different richness classes obtained in the present study differ significantly from the lifetimes obtained by Janes and Adler (1982), because the lifetimes obtained by James and Adler may have been affected by the age-dependent selection effects which grow with increasing distance. From the observed age distribution of all clusters within 1000 pc the results obtained in the present study are in close agreement with the lifetimes obtained by Wielen (1971).
Mahra H. S.
Pandey Ajay K.
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