Abstract
ABSTRACT An unidentified, broad absorption feature has been noticed in low-dispersion spectra of some carbon Mira variable stars and some C-S stars. Resembling a red-degraded molecular visible from 6372 A to 6394 A and being strongest at 6379 A, the feature exhibits little phase-dependent behavior among the C-S stars. Seemingly persistent in those C-S stars in which it has been studied, it is absent at the cooler phases of those C-S stars in which it has not been seen near maximum light. Evidence is presented that, though similar in appearance, the feature in the C-S stars may not be the same as that in the carbon Mira variables where calcium iedide is identified tentatively as the species responsible for the feature. And while it has not been seen in all carbon Miras exhibiting CaCl absorptions, the unidentified feature shares a similar temperature behavior with those absorptions due to CaCl. Key words: stellar spectra - C-S stars - molecular bands
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