Abstract
Atmospheric parameters are obtained for three short-period cepheids (TU Cas, SZ Tau and α UMi) from high dispersion spectra. Additionally, for these three stars and three long-period cepheids (RX Aur, X Cyg and T Mon) radial velocities are measured for metal lines and for H α . It is found that the beat cepheid TU Cas does not resemble the other stars as closely as expected indicating that it is not a classical cepheid as had been thought. This resolves the problem of the masses of beat cepheids. It is also concluded that differential velocities in the atmospheres of cepheids do not contribute greatly to the observed microturbulence.
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