DELTA SCT (Delta Scuti). Stars look so rock-solid in the nighttime sky, the constellations they make wheeling perpetually overhead the same ones Homer saw when he composed the Iliad and Odyssey.
Delta Sct is the prototype of a rare class of variable stars undergoing small pulsations within the range of a few hours; this leads to minor changes in the brightness of the star.
Gamma CrB is a delta Sct variable: 3.80-3.86, period 0.03 days (=43 minutes, 12 seconds).
Delta CrB: RS variable, 4.57-4.69.
SigmaA CrB is an RS and delta Sct variable with period of 1.14 days.
^ a b c d e f g h i j k l m NAME ALTAIR -- Variable Star of delta Sct type, database entry, SIMBAD. Accessed on line November 25, 2008.
 See also: Period, Delta, Constellation, Sky, Variable star
  
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