The photometric effect of rotation in the A stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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A Stars, Astronomical Photometry, Stellar Rotation, Atmospheric Models, F Stars, Main Sequence Stars, Stellar Atmospheres

Scientific paper

Previous studies of stellar rotation have been largely confined to the effects on individual stars in rigid rotation. These studies are extended in two ways: (1) detailed stellar atmosphere models are used to compute for the first time the photometric effects of differential as well as rigid rotation; results are given for both the Johnson and the Stromgren systems for late B, A and early F stars; (2) statistical results are obtained for an ensemble of stars in that spectral range, for comparison with the observed properties of galactic clusters. The well-known qualitative result that differential rotation produces a larger scatter in photometric diagrams than does rigid rotation is confirmed, but a number of quantitative subtleties is found that significantly complicate any comparison with observations.

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