Abstract
AbstractExtinction curves for core‐mantle and muiticored grains containing two allotropic carbon modifications are compared with far UV extinction observations of the stars R CrB and RY Sgr as well as interstellar extinction. We show that these grain models are consistent with the observed far UV extinction, but it is found that only those particles in which amorphous carbon is surrounded by graphite fit well the interstellar extinction curve and that of the R CrB‐type stars.
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