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Revised Empirical Formulae for the Absolute Magnitudes and Intrinsic Colors of RRab Stars

The relations between the physical parameters of the RRab stars and the Fourier parameters of their light curves have been reanalyzed on the basis of new CCD data. We show that the absolute magnitude M V and the dereddened color indices ( B − V ) 0 , ( V − I ) 0 are linear functions of the period and of the A 1 Fourier amplitude of the V light curve. Due to the large datasets, we are able to test the consistency of the formulae on independent sets. The present results are in good or fair agreement with our previous studies, despite the fewer number of significant parameters entering in the revised formulae.