Open Access

Fig. 8

image

2D non-LTE vs. 1D non-LTE (upper panels) and 2D non-LTE vs. 1D LTE (lower panels) abundance corrections for the O I 777 nm triplet integrated over all components as functions of effective temperature for the nine-day (left panels) and three-day (right panels) Cepheid model. The photometric phase ϕph is indicated by colour. Solid and dashed black lines depict the temperature dependence for M9 and M3, respectively, when fittingthe numerical data by a parabola.

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