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Fig. 2

image

Observed spectrum of Y CVn at 7.5 μm (1313.70–1358.45 cm−1) using SOFIA-EXES. The spectrum is corrected for the Doppler shift due to the star and Earth relative movement at the time of the observations. The resolving power is R ≃ 60 000 which provides us with a spectral resolution of ≃5.0 km s−1. Differentlines of several vibrational states of HCN (red, orange, and violet) and H13 CN (pink) are found in this spectrum. An ATRAN model of the atmospheric transmission is included in gray. The red and blue curves are the synthetic spectra derived from our spherically symmetric and asymmetric models, respectively.

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