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.
Estelle (given name) Estelle (given name) Estelle is a female given name from latin origin , and mean "star". Saint Estelle was a martyr who purportedly lived in Aquitania in the third century AD although the earliest references to her date from the Middle Ages. The earliest formats of this Saint's name: Eustella/Eustelle and Eustalia, morphed into Estelle by Provençal poet Frédéric Mistral due to association with "estela" (Occitan for "star", of which Estelle is essentially a phonetic rendering in French), Saint Estelle being the patron saint of the Felibrige, a literary and cultural association founded by Mistral and other Provençal writers to