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Related to shell star: sand dollar
shell starA hot main-sequence star, usually of spectral type B, whose complex spectrum shows sharp deep absorption lines with wings of bright emission lines superimposed on the normal absorption spectrum. It is now known that they are Be stars, the differences in appearance between the two arising from the directions in which they are observed.
shell star[′shel ‚stär]
A type of star which is believed to be surrounded by a tenuous envelope of gas, as indicated by bright emission lines in its spectrum.