Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...125..359g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 125, no. 2, Sept. 1983, p. 359-367. Sponsorship: Deutsche Forschungsgemeinscha
Astronomy and Astrophysics
Astrophysics
64
Ellipticity, Globular Clusters, Magellanic Clouds, Milky Way Galaxy, Astronomical Photography
Scientific paper
The apparent flattening-variations of 20 galactic- and 4 Magellanic Cloud globular clusters have been investigated by means of the Agfa-Contourfilm technique and an objective reduction method on plates obtained with telescopes of different f-ratios and scales. It is shown that in reality an individual isodensity contour can be approximated by an ellipse with an accuracy of only ±0.05 for the axis ratio, and, as to be expected, the position angle of the major axis becomes more and more indefinite for b/a > 0.92. Strong correlations between the average flatness, its standard deviation, and the velocity dispersion of well observed clusters, are found. All these empirical results indicate that the influences of tidal forces by the parent galaxy do not contribute much to the shape of globular clusters but that the shape is a complicated function of the distribution of orbital angular momentum of the member stars.
Geyer Edward H.
Hopp Ulrich
Nelles Bruno
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