There are over 50,000 known
References
*David H. Levy, "Observing variable stars : a guide for the beginner"
* [http://www.sai.msu.su/gcvs/gcvs/ General Catalogue of Variable Stars]
ee also
*
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General Catalogue of Variable Stars — The General Catalogue of Variable Stars (GCVS) is a list of variable stars. Its first edition, containing 10,820 stars, was published in 1948 by the Academy of Sciences of the USSR and edited by B. V. Kukarkin and P. P. Parenago. Second and third … Wikipedia
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