Abstract
This poster presents polarimetry and direct images in the atomic Na D (λ1= 5890 A, λ2= 5896 A) and K I (λ= 7699 A) resonance lines, showing shells around the nearby bright carbon stars R Scl and U Ant. They confirm results obtained in CO radio line observations. A simple analytical model shows that the observed intensities are consistent with resonance line scattering of stellar light provided that about 1% of the K and Na has remained in neutral form.
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