Globular clusters in nearby galaxies - Ellipticity of 30 clusters in M31

Astronomy and Astrophysics – Astronomy

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Andromeda Galaxy, Globular Clusters, Nebulae, Spatial Distribution, Ellipticity, Galactic Evolution, Milky Way Galaxy, Photographic Plates

Scientific paper

Three plates taken with the 2-m Bulgarian Ritchey-Chretien telescope have been scanned to yield isodensity contours giving the mean apparent ellipticity (epsilon-bar) and major-axis orientation for 30 globular clusters in the Andromeda Nebula. The range is epsilon-bar = 0.02-0.27, about the same as for globulars in the Galaxy; the overall average epsilon-bar = 0.109 + or - 0.010. The possible internal variation of these isodent parameters in some clusters is discussed.

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