WR140's dust shells emit 6 and 7.7 µm aromatic infrared bands whose peak wavelengths and widths match hydrogen-poor RCB stars, not standard interstellar classes.
E., Peeters , E., & Tielens , A
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The Aromatic Infrared Bands around the Wolf-Rayet Binary WR140 Revealed by JWST
WR140's dust shells emit 6 and 7.7 µm aromatic infrared bands whose peak wavelengths and widths match hydrogen-poor RCB stars, not standard interstellar classes.