DQ Herculis: Synchronous Photometry

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Science  14 Nov 1969:
Vol. 166, Issue 3907, pp. 876-877
DOI: 10.1126/science.166.3907.876


Synchronous signal averaging, applied to the photometry of the steller system DQ Herculis in order to study the 71.1-second pulsations discovered by Walker in 1956, yields a light curve which is a pure sinusoid, within the accuracy of measurement. The binary period is increasing, probably as a result of mass lost from the system.

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