A reliable determination of absolute luminosities of RR Lyrae variables would provide a crucial test of stellar evolution and a mean to determine the distance and age of globular clusters. The authors have developed a modification of the classical Baade-Wesselink method, aimed at exploiting the possibilities offered by multicolor photometric systems, by taking into proper account metallicity and gravity effects. Here the authors present the fundamental aspects of the method, emphasizing the importance of a self-consistent bidimensional approach to multicolor photometry, and give preliminary results of a first application to five field variables (SW And, RR Lyr, X Ari, SU Dra, VY Ser).
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