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.[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.[2][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.[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.[5][6]
^Balona, 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.
^Jerzykiewicz, 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.
^Carrier, 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.
^Samus, 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.
^Otero, 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.
^Watson, C.; Henden, A. A.; et al. "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.
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A LambdaEridaniVariable is a class of Be stars that show small amplitude variations of a few hundredths of a magnitude. The variations are highly regular...
LambdaEridani (λ Eri) is a star in the constellation Eridanus. It is visible to the naked eye on a dark night with an apparent visual magnitude of 4.27...
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General Catalogue of Variable Stars. Some of these are thought to be pulsating stars and are sometimes called LambdaEridanivariables. Porter, John M.;...
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A slow irregular variable (ascribed the GCVS types L, LB and LC) is a variable star that exhibit no or very poorly defined periodicity in their slowly...
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binary system of the white dwarf 40 Eridani B and the main sequence red dwarf 40 Eridani C. The pair 40 Eridani B/C was discovered by William Herschel...
Stellar black hole Compact star Quark star Exotic star Stellar core: EF Eridani Failed and theoretical stars Substellar object Brown dwarf Sub-brown dwarf...
effective temperature of 15,212 K in its outer envelope. It is a λ Eridanivariable, or periodic Be star, with a pulsation cycle lasting 1.073 days. The...
more likely to be a different type of variable, possibly a λ Eridanivariable or rotating ellipsoidal variable. This object is a B-type main-sequence...
dwarfs List of collapsars (black holes) List of notable variable stars List of semiregular variable stars List of stars that have unusual dimming periods...
van Maanen's Star 14.04 ly (4.30 pc) GJ 440 15.09 ly (4.63 pc) 40 Eridani B 16.25 ly (4.98 pc) Part of 40 Eridani system Stein 2051 B 18.06 ly (5.54 pc) Part of Stein...
absolutno by Karel Čapek. /ˈapsolutno/ Eridanus θ1 Eridani A Acamar /ˈækəmɑːr/ Eridanus α Eridani A Achernar The name was originally Arabic: آخر النهر...
to as rapidly oscillating α2 Canum Venaticorum variables. Both the roAp stars and some α2 CVn variables lie on the δ Scuti instability strip and are magnetic...
Sebastian; Paulson, Diane B. (November 2006), "The extrasolar planet e Eridani b – orbit and mass", The Astronomical Journal, 132 (5): 2206–2218, arXiv:astro-ph/0610247...
Beta Fornacis marking the shallow southern apex. Originally designated 12 Eridani by John Flamsteed, Alpha Fornacis was named by Lacaille as the brightest...
edition containing information on 20437 variable stars discovered and designated till 1968". General Catalogue of Variable Stars: 0. Bibcode:1971GCVS3.C.......
ISSN 0004-6361. S2CID 15874925. Murdin, P.; Penston, M. V. (1977-12-01). "The Lambda Orionis association". Monthly Notices of the Royal Astronomical Society...
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