Editing Variable star (section)

====Magnetic fields====

===== Alpha<sup>2</sup> Canum Venaticorum variables =====
{{Main|Alpha2 Canum Venaticorum variable}}

Alpha<sup>2</sup> Canum Venaticorum (α<sup>2</sup> CVn) variables are [[main sequence|main-sequence]] stars of spectral class B8–A7 that show fluctuations of 0.01 to 0.1 magnitudes (1% to 10%) due to changes in their magnetic fields.

=====SX Arietis variables=====
{{Main|SX Arietis variable}}
Stars in this class exhibit brightness fluctuations of some 0.1 magnitude caused by changes in their magnetic fields due to high rotation speeds.

=====Optically variable pulsars=====
{{Main|Pulsar}}

Few [[pulsar]]s have been detected in [[visible light]]. These [[neutron star]]s change in brightness as they rotate. Because of the rapid rotation, brightness variations are extremely fast, from milliseconds to a few seconds. The first and the best known example is the [[Crab Pulsar]].