Journal Article

Variations of the amplitudes of oscillation of the Be star Achernar

K. J. F. Goss, C. Karoff, W. J. Chaplin, Y. Elsworth and I. R. Stevens

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 411, issue 1, pages 162-166
Published in print February 2011 | ISSN: 0035-8711
Published online January 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17665.x
Variations of the amplitudes of oscillation of the Be star Achernar

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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.

Keywords: asteroseismology; techniques: photometric; stars: activity; stars: emission-line, Be; stars: individual: Achernar; stars: oscillations

Journal Article.  3485 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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