  We briefly describe a method of obtaining relative intrinsic stellar
parameters, such as absolute magnitudes and colors from the light curves of
fundamental mode RR Lyrae (RRab) stars. Absolute stellar parameters of
double-mode variables (Cepheids and RR Lyrae stars) can be computed from their
periods and intrinsic colors combined with stellar atmosphere and pulsation
models. By using these two methods, one can determine, e.g., the distance of
any RRab star, assuming that accurate multicolor photometry is available. By
applying this and a related method for computing metallicity, we derive
distance, reddening and metallicity distribution for the RRab stars of omega
Cen.
