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机译:Photometry of the globular cluster M54 and the Sagittarius dwarf galaxy: The age-metallicity relation
Bowling Green State Univ, Dept Phys & Astron, Bowling Green, OH 43403, USA, .;
Galaxies : individual (sagittarius) galaxies : star clusters; Galaxies : stellar content; Globular clusters : individual (m54); Stars : variables : general; Color-magnitude diagram; Rr lyrae variables; Ccd photometry; Spheroidal galaxy; Horizontal branches; Galactic halo; Milky-way; Stars; Reddenings; Luminosity;