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The Petersen diagram is a frequently used tool to constrain model parameterssuch as metallicity of radial double-mode pulsators. In this diagram the periodratio of the radial first overtone to the fundamental mode, P_1/P_0, is plottedagainst the period of the fundamental mode. The period ratio is sensitive tothe chemical composition as well as to the rotational velocity of a star. Inthe present study we compute stellar pulsation models to demonstrate thesensitivity of the radial period ratio to the opacity data (OPAL and OP tables)and we also examine the effect of different relative abundances of heavyelements. We conclude that the comparison with observed period ratios could beused successfully to test the opacity data.

The effect of different opacity data and chemical element mixture on the Petersen diagram