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Discrete Fourier Analysis of the Light Curve of S Persei


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K. A. Chipps

R. E. Stencel

University of Denver Observatories, Department of Physics and Astronomy, Denver, CO 80208


J. A. Mattei (deceased March 22, 2004)

AAVSO, 25 Birch Street, Cambridge, MA 02138


Received October 2003; revised December 2003


Abstract  A discrete Fourier analysis was performed on the validated S Persei visual light curve data as obtained from the American Association of Variable Star Observers (AAVSO). These observations span just over a century, from February of 1903 to July of 2003. This analysis was an attempt to find the fundamental periods of the variability of the red supergiant S Persei. Inspection of the S Per light curve indicates a likely complex combination of sinusoids of differing periods. Using Fourier analysis, four periods of various relative strengths were extracted from these data: 745, 797, 952, and 2857 days. Although some of these periods are similar to earlier results, they seem to indicate a more complex result than has previously been determined.

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