Shell star 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, the emission lines from an equatorial disk, and the narrow absorption lines are produced when the disc is seen nearly edge-on. Shell stars have spectral types O7.5 to F5, with rotation velocities of 200–300 km/s, not far from the point when the rotational acceleration would disrupt the star.
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,