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2011MNRAS.411..162G - Mon. Not. R. Astron. Soc., 411, 162-166 (2011/February-2)
Variations of the amplitudes of oscillation of the Be star Achernar.
GOSS K.J.F., KAROFF C., CHAPLIN W.J., ELSWORTH Y. and STEVENS I.R.
Abstract (from CDS):
We report on finding variations in amplitude of the two main oscillation frequencies found in the Be star Achernar, over a period of 5 yr. They were uncovered by analysing photometric data of the star from the Solar Mass Ejection Imager (SMEI) instrument. The two frequencies observed, 0.775 and 0.725/d, were analysed in detail and their amplitudes were found to increase and decrease significantly over the 5-yr period, with the amplitude of the 0.725/d frequency changing by up to a factor of 8. 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.
Abstract Copyright: 2010 The Authors. Journal compilation2010 RAS
Journal keyword(s): asteroseismology - techniques: photometric - stars: activity - stars: emission-line, Be - stars: individual: Achernar - stars: oscillations
Simbad objects: 14
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