Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101..873s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 101, March 1991, p. 873-883.
Astronomy and Astrophysics
Astronomy
61
Galactic Evolution, Galactic Structure, Globular Clusters, Spiral Galaxies, H I Regions, H Ii Regions, Halos, Magellanic Clouds, Stellar Evolution
Scientific paper
Velocities are presented for about 45 M33 star clusters, spanning the range of cluster ages (about 0.1-10 Gyr) in that system. It is concluded that: (1) there is a kinematic halo of old clusters, with a velocity dispersion of about 70 km/s; (2) there is little or no sign of rotation for the old, metal-poor cluster system (V/sigma not greater than 0.6); (3) young (blue) clusters rotate sensibly with the H I and H II disk gas (V/sigma not less than 5); and (4) the intermediate age/color clusters have similar rotational motion to the young clusters, with a marginally lower rotational velocity and higher dispersion. Although the properties of these clusters resemble those of the LMC clusters in terms of star formation history, the kinematics of the M33 clusters appear significantly different from what has been reported for the LMC cluster system, and more closely mimic the kinematics of the Milky Way system. These results are discussed in terms of disk heating and diffusion arguments versus collapse or formation scenarios.
Bothun Gragory D.
Caldwell Nelson
Christian Carol A.
Huchra John
Schommer Robert A.
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