Comparison of observed magnitudes and colors of Pollux (blue circles) with those predicted by the reference model (red triangles). An airmass of 1.0, a radius of 9.3 R⊙ and a distance of 10.36 pc are assumed. Solid error bars take into account only uncertainties due to stellar parameters (Table 2). Gray error bars take into account an additional contribution due to extinction and airmass. The former is set to half the difference in colors between models with E(B – V) = 0.00 and E(B − V) = 0.02, the latter to half the difference between corrections for an airmass of 1.0 and 1.1. In the upper right panel, the black squares show the difference between the observed and predicted magnitudes for the five Johnson filters.
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