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New photoelectric UBV photometry of 45 stars and spectroscopic observations of 24 stars are presented for NGC 1647, the cluster associated with the 3 d .15 Cepheid SZ Tauri. The resulting photometry, spectral classifications, and radial velocities are used with previously published photoelectric, photographic, spectroscopic, and proper motion studies of NGC 1647 for a detailed cluster analysis.

Galactic clusters with associated Cepheid variables. III - NGC 1647 and SZ Tauri