Gravity-darkening coefficient y (Kepler) versus effective temperature. The continuous line represents the Kurucz models (Eq. (7)), the dashed one denotes the PHOENIX plan-parallel models (Eq. (7)), and asterisks represent the results from Kurucz models by adopting Eq. (6). We used models with log g = 4.5, log [A/H] = 0.0, Vξ = 2 km s-1.
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