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Diameters of δ Cephei and η Aquilae Measured with the Navy Prototype Optical Interferometer
We have measured the diameters of the Cepheid variables δ Cephei (18 nights) and η Aquilae (11 nights) with the Navy Prototype Optical Interferometer. The primary results of these observations are the mean angular diameters ⟨θLD⟩ of these Cepheids: 1.520 ± 0.014 milliseconds of arc (mas) for δ Cep and …