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<title>Lambda Eridani variable</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Lambda Eridani variable</span></span>

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<div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="en" dir="ltr"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><p>A <b>Lambda Eridani Variable</b> is a class of <a href="Be_star" title="Be star">Be stars</a> 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 <b>periodic Be stars</b>.<sup id="cite_ref-balona_1-0" class="reference"><a href="#cite_note-balona-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> <a href="Lambda_Eridani" title="Lambda Eridani">Lambda Eridani</a> is an example and the prototype. This has been ascribed to non-radial pulsations, inhomogeneous rotating discs, or the rotation of the star itself.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup>

</p><p>These stars are rarely classified, or are classified incorrectly. The <a href="General_Catalogue_of_Variable_Stars" title="General Catalogue of Variable Stars">General Catalogue of Variable Stars</a> does not have a type for λ Eridani variables, only GCAS for <a href="Gamma_Cassiopeiae_variable" title="Gamma Cassiopeiae variable">Gamma Cassiopeiae variables</a> and <a href="Be_star" title="Be star">BE</a> for non-GCAS Be star variables. λ Eridani itself is incorrectly listed as a <a href="Beta_Cephei_variable" title="Beta Cephei variable">Beta Cephei variable</a>.<sup id="cite_ref-gcvs_4-0" class="reference"><a href="#cite_note-gcvs-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> The <a href="AAVSO" class="mw-redirect" title="AAVSO">AAVSO</a> 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.<sup id="cite_ref-vsx_5-0" class="reference"><a href="#cite_note-vsx-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-vsx_vizier_6-0" class="reference"><a href="#cite_note-vsx_vizier-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup>

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<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><cite id="CITEREFBalona1995" class="citation journal cs1">Balona, L. A (1995). <a rel="nofollow" class="external text" href="https://doi.org/10.1093%2Fmnras%2F277.4.1547">"Tests of the Pulsation and Starspot Models for the Periodic Be-Stars"</a>. <i>Monthly Notices of the Royal Astronomical Society</i>. <b>277</b> (4): <span class="nowrap">1547–</span>1554. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1995MNRAS.277.1547B">1995MNRAS.277.1547B</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1093%2Fmnras%2F277.4.1547">10.1093/mnras/277.4.1547</a></span>.</cite></span>

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<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><cite id="CITEREFJerzykiewiczKopackiPigulskiKołaczkowski2011" class="citation journal cs1">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". <i>Acta Astronomica</i>. <b>61</b> (3): <span class="nowrap">247–</span>273. <a href="ArXiv_(identifier)" class="mw-redirect" title="ArXiv (identifier)">arXiv</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://arxiv.org/abs/1110.4064">1110.4064</a></span>. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2011AcA....61..247J">2011AcA....61..247J</a>.</cite></span>

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<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><cite id="CITEREFCarrierBurkiBurnet2002" class="citation journal cs1">Carrier, F.; Burki, G.; Burnet, M. (2002). <a rel="nofollow" class="external text" href="https://doi.org/10.1051%2F0004-6361%3A20020174">"Search for duplicity in periodic variable Be stars"</a>. <i>Astronomy and Astrophysics</i>. <b>385</b> (2): 488. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2002A&A...385..488C">2002A&A...385..488C</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1051%2F0004-6361%3A20020174">10.1051/0004-6361:20020174</a></span>.</cite></span>

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<li id="cite_note-gcvs-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-gcvs_4-0">^</a></b></span> <span class="reference-text"><cite id="CITEREFSamusDurlevich2009" class="citation journal cs1">Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". <i>VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S</i>. <b>1</b>. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2009yCat....102025S">2009yCat....102025S</a>.</cite></span>

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<li id="cite_note-vsx-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-vsx_5-0">^</a></b></span> <span class="reference-text"><cite id="CITEREFOteroWatsonWils" class="citation web cs1">Otero, S. A.; Watson, C.; Wils, P. <a rel="nofollow" class="external text" href="https://www.aavso.org/vsx/index.php?view=about.vartypes">"Variable Star Type Designations in the VSX"</a>. <i>AAVSO Website</i>. <a href="American_Association_of_Variable_Star_Observers" title="American Association of Variable Star Observers">American Association of Variable Star Observers</a><span class="reference-accessdate">. Retrieved <span class="nowrap">19 July</span> 2014</span>.</cite></span>

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<li id="cite_note-vsx_vizier-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-vsx_vizier_6-0">^</a></b></span> <span class="reference-text"><cite id="CITEREFWatsonHenden2022" class="citation journal cs1">Watson, C.; Henden, A. A.; et al. (2022). <a rel="nofollow" class="external text" href="https://vizier.cds.unistra.fr/viz-bin/VizieR-4?-ref=VIZ65eb3c8c3268a7&-to=-4b&-from=-3&-this=-4&%2F%2Fsource=B%2Fvsx%2Fvsx&%2F%2Ftables=B%2Fvsx%2Fvsx&-out.max=1000&%2F%2FCDSportal=http%3A%2F%2Fcdsportal.u-strasbg.fr%2FStoreVizierData.html&-out.form=HTML+Table&-out.add=_r&%2F%2Foutaddvalue=default&-sort=_r&-order=I&-oc.form=sexa&-out.src=B%2Fvsx%2Fvsx&-nav=cat%3AB%2Fvsx%26tab%3A%7BB%2Fvsx%2Fvsx%7D%26key%3Asource%3DB%2Fvsx%2Fvsx%26HTTPPRM%3A&-c=&-c.eq=J2000&-c.r=++2&-c.u=arcmin&-c.geom=r&-source=&-source=B%2Fvsx%2Fvsx&-out.orig=standard&-out=OID&-out=n_OID&-out=Name&-out=V&-out=Type&Type=*LERI*&-out=l_max&-out=max&-out=u_max&-out=n_max&-out=f_min&-out=l_min&-out=min&-out=u_min&-out=n_min&-out=l_Period&-out=Period&-out=u_Period&-out=Sp&-out=RAJ2000&-out=DEJ2000&-meta.ucd=2&-meta=1&-meta.foot=1&-usenav=1&-bmark=GET">"VizieR Online Data Catalog: AAVSO International Variable Star Index VSX (Watson+, 2006-)"</a>. <i>VizieR On-line Data Catalog: B/VSX. Originally Published in: 2006SASS...25...47W</i>. <b>1</b>. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2015yCat....102027W">2015yCat....102027W</a><span class="reference-accessdate">. Retrieved <span class="nowrap">8 March</span> 2024</span>.</cite></span>

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</style><div id="Variable_stars302" style="font-size:114%;margin:0 4em"><a href="Variable_star" title="Variable star">Variable stars</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Stellar_pulsation" title="Stellar pulsation">Pulsating</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Cepheid_variable" title="Cepheid variable">Cepheids</a> and<br>cepheid-like</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Type_I_Cepheid" class="mw-redirect" title="Type I Cepheid">Type I</a> <small>(<a href="Classical_Cepheid_variable" title="Classical Cepheid variable">Classical cepheids</a>, <a href="Delta_Scuti_variable" title="Delta Scuti variable">Delta Scuti</a>)</small></li>

<li><a href="Type_II_Cepheid" title="Type II Cepheid">Type II</a> <small>(<a href="BL_Herculis_variable" title="BL Herculis variable">BL Herculis</a>, <a href="W_Virginis_variable" title="W Virginis variable">W Virginis</a>, <a href="RV_Tauri_variable" title="RV Tauri variable">RV Tauri</a>)</small></li>

<li><a href="RR_Lyrae_variable" title="RR Lyrae variable">RR Lyrae</a></li>

<li><a href="Rapidly_oscillating_Ap_star" title="Rapidly oscillating Ap star">Rapidly oscillating Ap</a></li>

<li><a href="SX_Phoenicis_variable" title="SX Phoenicis variable">SX Phoenicis</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Blue-white with<br>early spectra</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Alpha_Cygni_variable" title="Alpha Cygni variable">Alpha Cygni</a></li>

<li><a href="Beta_Cephei_variable" title="Beta Cephei variable">Beta Cephei</a></li>

<li><a href="Slowly_pulsating_B-type_star" title="Slowly pulsating B-type star">Slowly pulsating B-type</a></li>

<li><a href="PV_Telescopii_variable" title="PV Telescopii variable">PV Telescopii</a></li>

<li><a href="Blue_large-amplitude_pulsator" title="Blue large-amplitude pulsator">Blue large-amplitude pulsator</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Long-period_variable_star" title="Long-period variable star">Long-period</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<li><a href="Semiregular_variable_star" title="Semiregular variable star">Semiregular</a></li>

<li><a href="Slow_irregular_variable" title="Slow irregular variable">Slow irregular</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Gamma_Doradus_variable" title="Gamma Doradus variable">Gamma Doradus</a></li>

<li><a href="Solar-like_oscillations" title="Solar-like oscillations">Solar-like oscillations</a></li>

<li><a href="Pulsating_white_dwarf" title="Pulsating white dwarf">White dwarf</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Eruptive</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Pre-main-sequence_star" title="Pre-main-sequence star">Protostar</a> and <a href="Pre-main-sequence_star" title="Pre-main-sequence star">PMS</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Herbig_Ae/Be_star" title="Herbig Ae/Be star">Herbig Ae/Be</a></li>

<li><a href="Orion_variable" title="Orion variable">Orion</a>

<ul><li><small><a href="FU_Orionis_star" title="FU Orionis star">FU Orionis</a></small></li>

<li><small><a href="T_Tauri_star" title="T Tauri star">T Tauri</a></small></li></ul></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Giants and<br>supergiants</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Luminous_blue_variable" title="Luminous blue variable">Luminous blue variable</a></li>

<li><a href="R_Coronae_Borealis_variable" title="R Coronae Borealis variable">R Coronae Borealis</a> <small>(<a href="DY_Persei_variable" title="DY Persei variable">DY Persei</a>)</small></li>

<li><a href="Yellow_hypergiant" title="Yellow hypergiant">Yellow hypergiant</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Eruptive binary</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Double_periodic_variable" title="Double periodic variable">Double periodic</a></li>

<li><a href="FS_Canis_Majoris_variable" title="FS Canis Majoris variable">FS Canis Majoris</a></li>

<li><a href="RS_Canum_Venaticorum_variable" title="RS Canum Venaticorum variable">RS Canum Venaticorum</a></li></ul>

<ul><li><a href="Flare_star" title="Flare star">Flare</a></li>

<li><a href="Gamma_Cassiopeiae_variable" title="Gamma Cassiopeiae variable">Gamma Cassiopeiae</a></li>

<li><a href="Wolf%E2%80%93Rayet_star" title="Wolf–Rayet star">Wolf–Rayet</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Cataclysmic_variable_star" title="Cataclysmic variable star">Cataclysmic</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="AM_Canum_Venaticorum_star" title="AM Canum Venaticorum star">AM Canum Venaticorum</a></li>

<li><a href="Dwarf_nova" title="Dwarf nova">Dwarf nova</a></li>

<li><a href="Luminous_red_nova" title="Luminous red nova">Luminous red nova</a></li>

<li><a href="Polar_(star)" title="Polar (star)">Polar</a>

<ul><li><small><a href="Intermediate_polar" title="Intermediate polar">Intermediate</a></small></li></ul></li>

<li><a href="Supernova" title="Supernova">Supernova</a>

<ul><li><small><a href="Hypernova" title="Hypernova">Hypernova</a></small></li></ul></li>

<li><a href="SW_Sextantis_variable" title="SW Sextantis variable">SW Sextantis</a></li>

<li><a href="Symbiotic_binary" title="Symbiotic binary">Symbiotic</a>

<ul><li><small><a href="Symbiotic_nova" title="Symbiotic nova">Symbiotic nova</a></small></li>

<li><small><a href="Symbiotic_binary" title="Symbiotic binary">Z Andromedae</a></small></li></ul></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Rotating</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Non-spherical</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Rotating_ellipsoidal_variable" title="Rotating ellipsoidal variable">Rotating ellipsoidal</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Stellar spots</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="BY_Draconis_variable" title="BY Draconis variable">BY Draconis</a></li>

<li><a href="Variable_star#FK_Comae_Berenices_variables" title="Variable star">FK Comae Berenices</a></li></ul>

</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Magnetic fields</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Alpha2_Canum_Venaticorum_variable" title="Alpha2 Canum Venaticorum variable">α<sup>2</sup> Canum Venaticorum</a></li>

<li><a href="Pulsar" title="Pulsar">Pulsar</a></li>

<li><a href="SX_Arietis_variable" title="SX Arietis variable">SX Arietis</a></li></ul>

</div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Binary_star#Eclipsing_binaries" title="Binary star">Eclipsing</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">

<ul><li><a href="Algol_variable" title="Algol variable">Algol</a></li>

<li><a href="Beta_Lyrae_variable" title="Beta Lyrae variable">Beta Lyrae</a></li>

<li><a href="Planetary_transit_variable" class="mw-redirect" title="Planetary transit variable">Planetary transit</a></li>

<li><a href="W_Ursae_Majoris_variable" title="W Ursae Majoris variable">W Ursae Majoris</a></li></ul>

</div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div><b><span class="nowrap"><span class="noviewer" typeof="mw:File"></span> </span><a href="Portal%3AStar" class="mw-redirect" title="Portal:Star">Star portal</a></b> * <a href="List_of_variable_stars" title="List of variable stars">List</a></div></td></tr></tbody></table></div></div><div><div class="zim-footer">

This article is issued from <a class="external text" title="Last edited on 2025-06-23" href="https://en.wikipedia.org/wiki/?title=Lambda_Eridani_variable&oldid=1296976748">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

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