Using pulsation period instead of radius as a constraint for Cepheid evolutionary models systematically lowers the predicted radius, exposing a tension that is partially explained by a nonlinear radius increase in full-amplitude pulsation models.
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Pulsation periods reveal tension between theoretical and empirical radii for classical Cepheids in eclipsing binary systems
Using pulsation period instead of radius as a constraint for Cepheid evolutionary models systematically lowers the predicted radius, exposing a tension that is partially explained by a nonlinear radius increase in full-amplitude pulsation models.