Gravity-Darkening in Eclipsing Binaries. II: Early Main-Sequence Systems

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

An analysis of the photometric ellipticity effect in close binary systems consisting of early-type Main Sequence stars discloses that its excess over dynamical ellipticity is, on the whole, within limits explainable by linear laws of limb-and gravity-darkening over distorted stellar surfaces, with coefficients consistent with theoretical expectations based on the absence of convection in sub-surface layers. This contrasts with the situation encountered in our earlier investigation of W U Ma-type systems, and reveals that whereas the photometric properties of early-type Main Sequence systems appear to be normal in the light of the existing theories of their light changes, it is the W U Ma-type systems which confront us with unexplained phenomena in the form of anomalously large ellipticities; but their solution is as yet nowhere near in sight.

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