Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-10-05
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
6 pages, 6 figures, 1 table, to be published in MNRAS
Scientific paper
We report on finding variations in amplitude of the two main oscillation frequencies found in the Be star Achernar, over a period of 5 years. They were uncovered by analysing photometric data of the star from the SMEI instrument. The two frequencies observed, 0.775 c/d and 0.725 c/d, were analysed in detail and their amplitudes were found to increase and decrease significantly over the 5-year period, with the amplitude of the 0.725 c/d frequency changing by up to a factor of eight. The nature of this event has yet to be properly understood, but the possibility of it being due to the effects of a stellar outburst or a stellar cycle are discussed.
Chaplin William J.
Elsworth Yvonne
Goss K. J. F.
Karoff Chistoffer
Stevens Ian R.
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