Peranso supports the
to search for periodicities in Cepheids and RR Lyrae
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
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.