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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.cite-ref-balona-1-0[1] Lambda Eridani is an example and the prototype. This has been ascribed to non-radial pulsations, inhomogeneous rotating discs, or the rotation of the star itself.cite-ref-2[2]cite-ref-3[3]

These stars are rarely classified, or are classified incorrectly. The General Catalogue of Variable Stars does not have a type for λ Eridani variables, only GCAS for Gamma Cassiopeiae variables and BE for non-GCAS Be star variables. λ Eridani itself is incorrectly listed as a Beta Cephei variable.cite-ref-gcvs-4-0[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.cite-ref-vsx-5-0[5]cite-ref-vsx-vizier-6-0[6]

cite-note-balona-11. ↑ citerefbalona1995Balona, L. A (1995). "Tests of the Pulsation and Starspot Models for the Periodic Be-Stars". Monthly Notices of the Royal Astronomical Society. 277 (4): 1547–1554. Bibcode:1995MNRAS.277.1547B. doi:10.1093/mnras/277.4.1547.

cite-note-22. ↑ citerefjerzykiewiczkopackipigulskiko-aczkowski2011Jerzykiewicz, M.; Kopacki, G.; Pigulski, A.; Kołaczkowski, Z.; Kim, S.-L. (2011). "A CCD Search for Variable Stars of Spectral Type B in the Northern Hemisphere Open Clusters. VIII. NGC 6834". Acta Astronomica. 61 (3): 247–273. arXiv:1110.4064. Bibcode:2011AcA....61..247J.

cite-note-33. ↑ citerefcarrierburkiburnet2002Carrier, F.; Burki, G.; Burnet, M. (2002). "Search for duplicity in periodic variable Be stars". Astronomy and Astrophysics. 385 (2): 488. Bibcode:2002A&A...385..488C. doi:10.1051/0004-6361:20020174.

cite-note-gcvs-44. ↑ citerefsamusdurlevich2009Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.

cite-note-vsx-55. ↑ citerefoterowatsonwilsOtero, S. A.; Watson, C.; Wils, P. "Variable Star Type Designations in the VSX". AAVSO Website. American Association of Variable Star Observers. Retrieved 19 July 2014.

cite-note-vsx-vizier-66. ↑ citerefwatsonhenden2022Watson, C.; Henden, A. A.; et al. (2022). "VizieR Online Data Catalog: AAVSO International Variable Star Index VSX (Watson+, 2006-)". VizieR On-line Data Catalog: B/VSX. Originally Published in: 2006SASS...25...47W. 1. Bibcode:2015yCat....102027W. Retrieved 8 March 2024.