Abstract:
The radii of several Ap and Am stars have been compared with those of the normal A stars of the main sequence. Though the brighter Ap stars have a little larger radii than the main sequence stars, they may not be much different from those of the slightly evolved normal A stars. The Am stars have radii with which they appear to be merging with those of cooler A stars of the main sequence. The Ap stars have radii predominantly in the range of 1.8 to 3.4 solar radii, while the Am stars are mainly concentrated between 1.8 and 2.2 solar radii.
