A thin shell of ionized gas as the explanation for infrared excess among classical Cepheids

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Fig. 11

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IR excess fitting results of ionized gas shell (red curve, see Sect. 5and Appendix B) presented with residuals. Yellow region is the error on the magnitude obtained using the covariance matrix of the fitting result. Pulsation phase ϕ of Spitzer observations and SPIPS interpolation is indicated.

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