Shell star variables. Pleione and Gamma Cassiopeiae itself are both variable stars that have intermittent shell episodes where strong shell features appear in the spectrum and the brightness increases or decreases significantly. At other times the shell is not detectable in the spectrum, and even the emission lines may disappear. Shell star A shell star is a star having a spectrum that shows extremely broad absorption lines, plus some very narrow absorption lines. They typically also show some emission lines, usually from the Balmer series but occasionally of other lines. The broad absorption lines are due to rapid rotation of the photosphere,
A Star Is Born (2018 soundtrack) A Star Is Born (2018 soundtrack) A Star Is Born is the soundtrack album to the 2018 musical film of the same name, performed by its stars Lady Gaga and Bradley Cooper. It was released on October 5, 2018, by Interscope Records. Gaga and Cooper collaborated on the soundtrack album with an assortment of country musicians, including Lukas Nelson, who also stars in the film as a member of Cooper's band. For the more pop-oriented songs on the soundtrack, Gaga teamed up with recurring collaborator DJ White Shadow. The soundtrack also includes contributions from Jason Isbell, Mark Ronson, Diane Warren,