Astronomy:Lambda Eridani variable

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Short description: Type of variable star
Light curve of Lambda Eridani, showing variation in light levels over a few days in November 2018
Light curve of Lambda Eridani, the prototype star of the class

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]


References

  1. ↑ 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. doi:10.1093/mnras/277.4.1547. Bibcode: 1995MNRAS.277.1547B. 
  2. ↑ 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. Bibcode: 2011AcA....61..247J. 
  3. ↑ Carrier, F.; Burki, G.; Burnet, M. (2002). "Search for duplicity in periodic variable Be stars". Astronomy and Astrophysics 385 (2): 488. doi:10.1051/0004-6361:20020174. Bibcode: 2002A&A...385..488C. 
  4. ↑ Samus, N. N. 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. 
  5. ↑ Otero, S. A.; Watson, C.; Wils, P.. "Variable Star Type Designations in the VSX". AAVSO Website. American Association of Variable Star Observers. https://www.aavso.org/vsx/index.php?view=about.vartypes. Retrieved 19 July 2014. 
  6. ↑ Watson, C. 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. 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. Retrieved 8 March 2024. 



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