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 film) Ultra HD Blu-ray on February 19. The home video release will feature 10 minutes of never-before-seen musical performances by Cooper and Gaga, and jam recording sessions of songs like "Midnight Special", "Is That Alright?" and "Baby What You Want Me to Do". A behind-the-scenes feature called "The Road to Stardom: Making A Star Is Born" would also be included along with the music videos for songs from the soundtrack: "Shallow", "Always Remember Us This Way", "Look What I Found" and "I'll Never Love Again". The 4K Blu-ray format will have Dolby Vision high-dynamic-range video and Dolby Atmos sound which was