Radii of some Ap, AM and A stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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A Stars, Radii, Size Determination, Stellar Luminosity, Magnetic Stars, Main Sequence Stars, Stellar Evolution, Stellar Spectra

Scientific paper

Based on the observed energy curves of nine Ap stars, three Am stars, four normal A stars and one F0 V magnetic star, their radii have been estimated. Thence, the bolometric magnitudes have been obtained and a plot between the log of the electron temperature and bolometric magnitude 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 bolometric magnitude are much closer to those computed by Mihalas (1966) than to the ones given by Davis and Webb (1970), the latter being about 0.1 m more negative than the former.

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