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of BY Draconis variables (particularly in their H and K lines) are similar to RS CVn stars, which are another class of variable stars that have active chromospheres.

References

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Further reading

* Samus N.N., Durlevich O.V., et al. Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.)
* Schaaf, Fred, The Brightest Stars, Wiley, 2008

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