机译:Hubble Space Telescope WFPC2 photometry of M33: Properties of the halo star clusters and surrounding fields
Wesleyan Univ, Dept Astron, Middletown, CT 06459, USA, .;
Galaxies : formation; Galaxies : halos; Galaxies : star clusters; Galactic globular-clusters; Color-magnitude diagrams; Cepheid distance scale; Large-magellanic-cloud; Bvi ccd photometry; Red clump stars; Metallicity dependence; Horizontal branches; Galaxy; Luminosity;