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.
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- American Association of Variable Star Observers The largest organization for variable stars: provides professional and amateur collaboration, research, and analysis of variable star observations.
- 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.
- Astronomical Society of South Australia ASSA's variable star group. News, FAQ, charts, and software.
- 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.
- 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.