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Using a new grism at the Keck Interferometer, we obtained spectrallydispersed (R ~ 230) interferometric measurements of the Mira star R Vir. Thesedata show that the measured radius of the emission varies substantially from2.0-2.4 microns. Simple models can reproduce these wavelength-dependentvariations using extended molecular layers, which absorb stellar radiation andre-emit it at longer wavelengths. Because we observe spectral regions with andwithout substantial molecular opacity, we determine the stellar photosphericradius, uncontaminated by molecular emission. We infer that most of themolecular opacity arises at approximately twice the radius of the stellarphotosphere.Comment: 12 pages, including 3 figures. Accepted by ApJ

Stellar and Molecular Radii of a Mira Star: First Observations with the Keck Interferometer Grism