Astronomy:Lambda Eridani variable
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 16 stars included as λ Eri variables, five of them only suspected, and 13 combined with other types of variation.[5]
References
- ↑ 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.
- ↑ 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.
- ↑ 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.
- ↑ 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.
- ↑ Otero, S. A.; Watson, C.; Wils, P.. "Variable Star Type Designations in the VSX". AAVSO Website. American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=about.vartypes. Retrieved 19 July 2014.
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