shell star A hot main-sequence star, usually of spectral class B, A, or F, whose spectrum shows bright emission lines presumed to be due to a gaseous ring or shell surrounding the star. Variable shell stars, in which the ejection of a shell is accompanied by a temporary fade, are known as Gamma Cassiopeiae stars. Related categories • TYPES OF STARS STELLAR ASTROPHYSICS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) |