A search for a secondary frequency in the large-amplitude Delta Scuti star CY Aquarii
Monthly Notices of the Royal Astronomical Society, Volume 266, No. 1, Year 1991
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We have obtained V photometry of the large-amplitude Delta Scuti star CY Aquarii over a 3-week period at observatories in Australia, South Africa and the USA. Analysis of this photometry gives a conservative upper limit of 1.5 mmag for the amplitude of any long-lived secondary oscillation in the star.