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The earliest infrared light curves

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Dorrit Hoffleit

Yale University Observatory, New Haven, CT 06511

Received 29 May 1987

Abstract

In 1932 John S. Hall, a graduate student at Yale, built a caesium-oxide photoelectric photometer giving an effective wavelength of about 8000�.  With this he observed the Cepheid zeta Gem. Later Dr. A. L. Bennett used the same equipment to observe many variables. His light curves for only AO Cas, S Sge, and RT Aur were published. When Bennett was called for war work by the Navy he left behind observations on 30 long period variables and a few others of short period. As he did not return to astronomy after the war this wealth of observations has never been published.