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RR Lyrae are pulsating yellow horizontal branch stars, with a mass of around half the Sun's. RR Lyrae stars shed mass prior to becoming RR Lyrae and consequently, RR Lyrae were once stars with similar or slightly less mass than the sun, around 0.8 solar masses. They pulse in a manner similar to Cepheid Variables, but some important differences exist.
Vega, "Falling Eagle" or "The Harp Star", is only the fifth brightest star, but it dominates the summer skies in the northern hemisphere, with a transit date of 1 July.About 12,000 years ago Vega served as the Pole Star, and it will again in another 12,000 years.Beta Lyrae, sometimes known as "Sheliak" (Tortoise), is a prototype of a variable star in which a close companion is transferring matter to its gigantic primary. In Beta Lyrae's case, the transference is occurring very rapidly. Eventually the system will become an Algol variable. (See below for its values.)

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