Radio flares extending to about 1 A.U., not associated with X-ray activity. Orbital and rotation periods synchronized. The various Algol components must not be confused with the visual components ADS 2362 B-E, optical companions at much greater distances from A. Two formerly additionally desig- nated components D and E, inferred on the basis of an apparent 32 year apsidal motion, are now considered spurious. The components usually designated Algol A, B, C, sometimes A, a, P. The prototype star proves to be a more a complicated system than most of the Algol-type stars, i.e., compact triple system with separation of the components well under 0.1". The first period determined by Goodricke in 1783, who also interpreted the variations as due to eclipses. Variability information variable star identificationĪDS 2362A is the prototype Algol star, first discovered as variable by Montanari in 1669. Spectral / color information spectral class Position, motion, parallax: position (J2000) Object is infrared source (NASA merged infrared catalogue, Schmitz et al., 1978) (Preliminary Version) (Hoffleit+, 1991) note (category: star names):ĪLGOL Gorgona Gorgonea Prima Demon Star El Ghoul. Gorgona, Gorgonea Prima, Demon Star, El Ghoulĭata from The Bright Star Catalogue, 5th Revised Ed. Combined General Catalogue of Variable Stars (Vol.4th Catalog of Orbits of Visual Binaries.The Washington Visual Double Star Catalog, 1996.0.Smithsonian Astrophysical Observatory Star Catalog.The Bright Star Catalogue, 5th Revised Ed.The object was found in the following catalogues:
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