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.
Hero (given name) Hero (given name) Hero is a given name of Ancient Greek origin meaning "hero." When occurring in English discussions of classical literature, it is sometimes transliterated as Hērō (Ancient Greek: Ἡρώ). The Ancient Greeks pronounced this name along the lines of /he.roː/ while present-day English speakers pronounce it /ˈhi.ɹoʊ/. A modern Greek version of the name is Iro (Ηρώ). In literature, female characters named Hero include one of the titular star-crossed lovers of the Ancient Greek myth Hero and Leander, a wronged bride-to-be in William Shakespeare's 1599 comedy "Much Ado About Nothing," and the protagonist of Georgette Heyer's 1944 Regency