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classifying variable stars via Fourier components


  Recent discussions have mentioned the subclasses of RR Lyrae
stars.  I see that a paper in a recent issue of PASP,

      "WWW database of variable star Fourier coefficients"

by Morgan (PASP 115, p. 1250, Oct 2003) provides information
which may be used to classify the various types.  Specifically,
see Figure 1.

  The database is at

      http://nitro9.earth.uni.edu/fourier/

and a variant of Figure 1 from the paper is available as

      http://nitro9.earth.uni.edu/fourier/graphs/galr21.jpg

  Pehaps this will be of some use.

                                             Michael Richmond