A two-filter infrared Wesenheit magnitude, W(J,3.6), simultaneously corrects Cepheid distances for extinction and metallicity, as shown with PHOENIX model atmospheres and calibrated with Milky Way, LMC, and IC 1613 Cepheids.
The J and 3.6 PL plots are vertically offset from the W(J,3.6) PL relation for clarity
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Chicago-Carnegie Hubble Program (CCHP) A Multi-Wavelength Search for the Effects of Metallicity on the Cepheid Distance Scale. Part II: Theoretical Models and Synthetic Spectra
A two-filter infrared Wesenheit magnitude, W(J,3.6), simultaneously corrects Cepheid distances for extinction and metallicity, as shown with PHOENIX model atmospheres and calibrated with Milky Way, LMC, and IC 1613 Cepheids.