A Lambda Eridani Variable is a class of Be stars that show small amplitude variations of a few hundredths of a magnitude.
The variations are highly regular with periods between 0.5 and 2.0 days, and they were initially described as periodic Be stars.
This has been ascribed to non-radial pulsations, inhomogeneous rotating discs, or the rotation of the star itself.
λ Eridani itself is incorrectly listed as a Beta Cephei variable.
[4] The AAVSO International Variable Star Index defines a LERI type of variability, with 51 stars included as λ Eri variables, 16 of them only suspected, and 32 combined with other types of variation.