Editing RR Lyrae variable (section)

=={{Anchor|Bailey Types}}Classification==
The RR Lyrae stars are conventionally divided into three main types,<ref name="smith2004"/> following classification by [[Solon Irving Bailey|S.I. Bailey]] based on the shape of the stars' brightness curves:
* RRab variables are the most common, making up 91% of all observed RR Lyrae, and display the steep rises in brightness typical of RR Lyrae
* RRc are less common, making up 9% of observed RR Lyrae, and have shorter periods and more sinusoidal variation
* RRd are rare, making up between <1% and 30%<ref name=george>{{cite journal|last1=Christensen-Dalsgaard|first1=J.|last2=Balona|first2=L. A.|last3=Garrido|first3=R.|last4=Suárez|first4=J.C.|title=Stellar Pulsations: Impact of New Instrumentation and New Insights|journal=Astrophysics and Space Science Proceedings|date=Oct 20, 2012|url=https://books.google.com/books?id=uvWyxYL1Z0AC&pg=PA103|isbn=978-3-642-29630-7}}</ref> of RR Lyrae in a system, and are double-mode pulsators, unlike RRab and RRc