2011A&A...533A..43E -
Astronomy and Astrophysics, volume 533A, 43-43 (2011/9-1)
Gravity darkening in rotating stars.
ESPINOSA LARA F. and RIEUTORD M.
Abstract (from CDS):
Interpretation of interferometric observations of rapidly rotating stars requires a good model of their surface effective temperature. Until now, laws of the form Teff∝ geffβ have been used, but they are only valid for slowly rotating stars. We propose a simple model that can describe the latitudinal variations in the flux of rotating stars at any rotation rate.This model assumes that the energy flux is a divergence-free vector that is antiparallel to the effective gravity.When mass distribution can be described by a Roche model, the latitudinal variations in the effective temperature only depend on a single parameter, namely the ratio of the equatorial velocity to the Keplerian velocity. We validate this model by comparing its predictions to those of the most realistic two-dimensional models of rotating stars issued from the ESTER code. The agreement is very good, as it is with the observations of two rapidly rotating stars, α Aql and α Leo. We suggest that as long as a gray atmosphere can be accepted, the inversion of data on flux distribution coming from interferometric observations of rotating stars uses such a model, which has just one free parameter.
Abstract Copyright:
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Journal keyword(s):
stars: atmospheres - stars: rotation
Simbad objects:
4
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