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Title:
Variations of the amplitudes of oscillation of the Be star Achernar
Authors:
Goss, K. J. F.; Karoff, C.; Chaplin, W. J.; Elsworth, Y.; Stevens, I. R.
Affiliation:
AA(School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT), AB(School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT; Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark), AC(School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT), AD(School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT), AE(School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 411, Issue 1, pp. 162-166. (MNRAS Homepage)
Publication Date:
02/2011
Origin:
WILEY
Astronomy Keywords:
asteroseismology, techniques: photometric, stars: activity, stars: emission-line, Be, stars: individual: Achernar, stars: oscillations
Abstract Copyright:
© 2010 The Authors. Journal compilation © 2010 RAS
DOI:
10.1111/j.1365-2966.2010.17665.x
Bibliographic Code:
2011MNRAS.411..162G

Abstract

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-1, 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-1 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.
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