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Published online by Cambridge University Press: 12 April 2016
The scope of this review will be to summarize our knowledge of Cepheids at the present time concentrating primarily on the observational results obtained but at the same time relating these to the relevant results of pulsation and evolution theory. Of the many previous reviews of pulsating stars we would mention especially Payne-Gaposchkin and Gaposchkin (1938), Ledoux and Walraven (1958), Christy (1966a) and Cox (1974) as providing an excellent background to the theoretical and observational aspects of the subject. Because of these reviews we will concentrate on the more recent results obtained in connection with Cepheids. At the end a special section is devoted to the double-mode Cepheids as they are particularly relevant to this Colloquium.