Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...283..598v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 283, Aug. 15, 1984, p. 598-600.
Astronomy and Astrophysics
Astrophysics
40
Galactic Clusters, Galactic Evolution, Globular Clusters, Magellanic Clouds, Ellipticity, Statistical Tests, Stellar Luminosity
Scientific paper
It is shown that the apparent flattening of heavily reddened Galactic globular clusters is significantly affected by patchy foreground absorption. After eliminating clusters with Av greater than 1.0 it is found that LMC clusters of all ages are more highly flattened than Galactic globulars at the 99.2 percent confidence level. In particular it is seen that Cloud clusters with ages greater than 5 x 10 to the 9th yr are significantly more flattened than Galactic globular clusters. Among LMC clusters, ellipticity is found to correlate both with luminosity and with cluster age. Using 'bootstrap' techniques, it is shown that the correlation of LMC cluster age with ellipticity is not statistically significant after the dependence of ellipticity on luminosity is removed. Conversely, the dependence of ellipticity on luminosity is statistically significant at the 97.5 percent level after the apparent dependence of ellipticity on age is removed.
Morbey Christopher L.
van den Bergh Sidney
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