Variable Stars are stars that change brightness. Their brightness can change from just a fraction (not even noticeable to the naked eye) up to 20 magnitudes. To get an idea of how much a magnitudes is, consider that the difference between brightest star one can see outside at night (in a fairly dark area) and the dimmest is about 6 magnitude. Over 300,000 variable stars are known and have been cataloged.
American Association of Variable Star Observers
The largest organization for variable stars: provides professional and amateur collaboration, research, and analysis of variable star observations.
Astronomical Society of South Australia
ASSA's variable star group. News, FAQ, charts, and software.
General Catalog of Variable Stars Research Group
Research group working on the GCVS, Sternberg Astronomical Institute, Moscow, Russia. Includes catalogs and publications.
Information Bulletin on Variable Stars
The IBVS is a bulletin of Commissions 27 and 42 of the International Astronomical Union, published by Konkoly Observatory, Budapest, Hungary.
The Minima of Algol
An article by Alan MacRobert from Sky and Telescope Magazine about the star Algol (Beta Persei) was the first eclipsing variable star ever discovered.
A Ritzian Interpretation of Variable Stars
A study on the nature of the speed of light in space using light curves and spectroscopic observations of variable stars as evidence.
The Top Twelve Naked-Eye Variable Stars
An article by John Isles from Sky and Telescope Magazine.
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Last update:May 24, 2014 at 7:24:11 UTC