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,
Esther (given name) Esther (given name) Esther () is a feminine given name known from the Jewish queen Esther, eponymous heroine of the "Book of Esther". According to the Hebrew Bible, queen Esther was born with the name Hadassah ("Myrtle"). Her name was changed to Esther to hide her identity upon becoming queen of Persia. The root of Esther in Hebrew is "hester" () "Hidden". The name can be derived from the Old Persian "stāra" (NPer. ستاره "setāra", meaning "star") although some scholars identify Esther with the name of the Babylonian goddess of love "Ishtar". Esther first occurs as a given name in