Semiregular variables may show a definite period on occasion, but also go through periods of irregular variation.

After establishing the seasonal pattern, methods can be implemented to eliminate it from the time-series to study the effect of other components such as cyclical and irregular variations.

The supergiant consistently displays irregular photometric, polarimetric and spectroscopic variations, phenomena pointing to complex activity on the star's surface and its extended atmosphere.

Mu Cephei is currently an unstable star, showing irregular variations in light output, temperature, and size.

They exhibit irregular variations in their luminosity due to the outflow of matter.

This regularity is the most consistent in the case of dental stops in older texts; later monuments often show irregular variation of this rule.

Shell stars, like Pleione and Gamma Cassiopeiae, are blue supergiants with irregular variations caused by their abnormally high speed of rotation.

He keeps shifting the intensity so that, even though we can force our way through his field, the irregular variations make it impossible to line up anything.

The Fraternité and Égalité (1 and 2) arcs have demonstrated irregular variations in their relative brightness.