TITLE

Algol

PUB. DATE
January 2009
SOURCE
World Book Science Dataset;1/1/2009, p1
SOURCE TYPE
Encyclopedia
DOC. TYPE
Reference Entry
ABSTRACT
Algol, a variable star in the constellation Perseus. (A variable star is one that changes in brightness.) Algol, which was observed by the ancient Greeks and named by the Arabs, is now known to be a complex system of at least four stars revolving around one another. A pair of the stars forms an eclipsing binary�two stars that pass in front of each other in turn, causing a periodic (cyclical) dimming of their combined light. Algol dims regularly every 21 days and 21 hours.
ACCESSION #
37310314

 

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