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The Determination Of Double Mode Variable Star Periods, Arne A. Henden
The Determination Of Double Mode Variable Star Periods, Arne A. Henden
Physics & Astronomy ETDs
ABSTRACT
The problem of determining the periods of objects oscillating in one or more modes is discussed. Although the methods described are applicable to many different kinds of objects and observations, the discussion has been limited to double mode Cepheid stars.
Two methods of solution are followed in detail. An autocorrelation technique based on the scatter of points in an amplitude-phase plane is used for most cases. A means of calculating smoothed mean curves is discussed. A Fourier transform method is presented for closely spaced data points, with prewhitening included for accurate secondary period and amplitude determinations.
Three test problems …