Spectra of the visible objects at the position of the infrared source CRL 2688 indicate that these are nebulosities reflecting the light of an obscured F5 Ia star. Apart from this apparently normal spectrum, strong absorption features identified as molecular C3 and emission lines identified as molecular C2 and forbidden S II are observed. Our observations suggest that an F5 Ia star surrounded by a dense shell is at the position of the infrared source.
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Crampton et al. (1975) studied this question.