Cepheid masses and cepheid winds

Masses of Cepheids with bumps in their light and velocity curves (bump Cepheids) and those with two pulsation modes (beat or double-mode Cepheids) can be made equal to masses obtained from the evolution theory mass-luminosity relation if they have helium-enriched convection zones. The cause of this enrichment cannot be diffusion of helium-enriched convection zones. The cause of this enrichment cannot be diffusion of helium from below with subsequent mixing in and between the H+He I and He II convection zones. The probable cause of the composition inhomogeneity seems to be a Cepheid wind which depletes hydrogen more than helium as apparently occurs in the solar wind. A layer with Y=0.75 and Z=0.02 external to the 70,000 K level allows 7 M/sub sun/ Cepheids to give the proper periods and light and velocity curve bumps at their evolution theory luminosity. This helium-deficient wind, if only a little stronger than that in the Sun, needs 106--107 years. Barely enough time is available for 7 m/sub sun/ Cepheids, but there is plenty for the 4--5 M/sub sun/ beat Cepheids to give their observed period ratios