Peranso supports the Lafler-Kinman algorithm
to search for periodicities in Cepheids and RR Lyrae variables

Peranso 1.34 features the implementation of the Lafler-Kinman algorithm (Lafler J, Kinman T.D., 1965). Lafler-Kinman is an effective method to analyze Cepheids or RR Lyrae time series in search for periodic signals. It is a so called "string-length method". These methods fold the observation data on a series of trial periods, and at each trial period the sum of the lengths of line segments joining successive points (the string-length) is calculated. Minima in a plot of string-length versus trial frequency indicate possible periods. Peranso implements other string methods such as Dworetsky and Renson.


Lafler J., Kinman T.D., An RR Lyrae Star Survey with the Lick 20-INCH Astrograph II. The Calculation of RR Lyrae Periods by Electronic Computer, Astrophysical Journal Supplement, vol 11, p. 216, 1965.



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