Radii of some Ap, Am and A stars

Abstract

Based on the observed energy curves of nine Ap stars, three Am stars, and four normal A stars and one F0 V magnetic star, their radii have been estimated. Thence, the bolometric magnitudes Mbol have been obtained and a plot between log Te and Mbol of these stars shows that a majority of Ap and Am stars are a little above the zero-age Main-Sequence, suggesting that they are slightly more evolved as compared to the normal A stars. The bolometric corrections derived from the above Mbol are much closer to those computed by Mihalas than to the ones given by Davis and Webb, the latter being about 0 ͫ.1 more negative than the former.