Theoretical models of 10 day Cepheids

New hydrodynamic techniques coupled with improved opacities have produced light curves that can now be compared directly with the observations. A new dynamic zoning method due to J. Castor has resolved the front of the hydrogen ionization region, allowing effects due to zoning to be separated from the real effects occurring in the limited-amplitude nonlinear pulsation models. New low-temperature opacities have corrected for blanketing in the atmosphere to produce color-T/sub eff/ relationships which are in general agreement with the observations (Kraft-Oke) and a color-color loop for a 10 day Cepheid that is in good agreement with the observation of the Cepheid S Nor (Fernie).