Kinematics of star clusters in M33

Abstract

view Abstract Citations (66) References (38) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Kinematics of Star Clusters in M33 Schommer, R. A. ; Christian, C. A. ; Caldwell, Nelson ; Bothun, G. D. ; Huchra, John Abstract We present velocities for ~45 M33 star clusters, spanning the range of cluster ages (~0.1-10 Gyr) in that system. We conclude that: (1) there is a kinematic halo of old clusters, with a velocity dispersion of ~70 km/s; (2) there is little or no sign of rotation for the old, metal poor cluster system (V/σ<=0.6) (3) young (blue) clusters rotate sensibly with the HI and HII disk gas (V/{σ>=5) (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. We briefly discuss these results in terms of disk heating and diffusion arguments versus collapse or formation scenarios. Publication: The Astronomical Journal Pub Date: March 1991 DOI: 10.1086/115732 Bibcode: 1991AJ....101..873S Keywords: Galactic Evolution; Galactic Structure; Globular Clusters; Spiral Galaxies; H I Regions; H Ii Regions; Halos; Magellanic Clouds; Stellar Evolution; Astrophysics; GALAXIES: LOCAL GROUP full text sources ADS | data products SIMBAD (47) NED (1)