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,
Aodh (given name) (given name)). Pet forms of the name formed with the diminutive "-án" include Aodhán and Ádhán (Old Irish "Aedán"), names which are sometimes anglicized as Aidan, Aiden, and Edan. A double diminutive is Aodhagán and its modern form Aogán. Maodhóg (Old Irish "Máedóc"), anglicized Mogue, and the Welsh form Madog are formed from the affectionate prefix "mo-" and the separate diminutive "-og". It was also used in Roman Britain as a native form of the Latin Dominus. All of these variants are or . The spelling "Aogán" reflects the loss of the light "dha" syllable, pronounced , but the "o"