Astronomy and Astrophysics – Astronomy
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.199..565f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 199, May 1982, p. 565-580. Research supported by the Consejo Nacional d
Astronomy and Astrophysics
Astronomy
144
Chronology, Ellipticity, Galactic Evolution, Galactic Structure, Globular Clusters, Magellanic Clouds, Hertzsprung-Russell Diagram, Milky Way Galaxy, Star Distribution, Visual Observation
Scientific paper
It is pointed out that the rich star clusters of the Magellanic Clouds resemble the globular clusters of the Galaxy. The present investigation has the objective to determine the shapes of these clusters and their dependence on age. The study has been restricted to the Large Magellanic Cloud (LMC) because the Small Magellanic Cloud (SMC) does not provide a large enough sample for the statistical analysis. The shapes of globular clusters are usually expressed in terms of ellipticities. Attention is given to the measurement of ellipticities with the aid of a ruler and a graduated magnifying glass, star count data on 12 LMC clusters, and age estimates. It is found that estimates of the ellipticities of globular clusters made by eye are in excellent agreement with those based on star counts. The ellipticity-age relation is probably explained most naturally by internal evolution in the structure of globular clusters.
Fall Michael S.
Frenk Carlos S.
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