On the flattening of globular clusters

Details On the flattening of globular clusters On the flattening of globular clusters

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...230...67d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 230, no. 1, April 1990, p. 67-72.

Astronomy and Astrophysics

Astrophysics

27

Andromeda Galaxy, Brightness, Galactic Evolution, Globular Clusters, Galactic Structure, Star Distribution, Stellar Evolution, Stellar Magnitude

Scientific paper

A compilation of data on cluster flattenings in the Galaxy and in M 31 shows that the brightest globular clusters are also the roundest. This is confirmed by new observations of 13 of the brightest globular clusters in M 31. While this correlation has a few exceptions in the Galaxy as well as in M 31, and remains to be explained, another one is revealed. Globular clusters with shorter relaxation times tend to be rounder. This correlation is readily understood, if flattening is a consequence of rotation: initially flattened clusters become rounder in the course of their dynamical evolution, as they lose angular momentum as well as stars. Globular clusters in M 31 are also inferred to rotate on the average faster than in the Galaxy. The Magellanic Cloud clusters are dynamically too young to reveal any correlation.

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