Variations of the amplitudes of oscillation of the Be star Achernar

Kym Goss; C Karoff; William Chaplin; Yvonne Elsworth; Ian Stevens

doi:10.1111/j.1365-2966.2010.17665.x

Variations of the amplitudes of oscillation of the Be star Achernar

Kym Goss, C Karoff, William Chaplin, Yvonne Elsworth, Ian Stevens

Physics and Astronomy

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Abstract

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.

Original language	English
Pages (from-to)	162-166
Number of pages	5
Journal	Royal Astronomical Society. Monthly Notices
Volume	411
Issue number	1
Early online date	28 Oct 2010
DOIs	https://doi.org/10.1111/j.1365-2966.2010.17665.x
Publication status	Published - 1 Feb 2011

Bibliographical note

The definitive version is available at www.blackwell-synergy.com

Keywords

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

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10.1111/j.1365-2966.2010.17665.x

Goss2011MNRAS
© 2010 The Authors
Final published version, 0.99 MB

Birmingham Astrophysics - Rolling Grant 2007-2012
Ponman, T., Cruise, M., Freise, A., Raychaudhury, S., Smith, G., Speake, C., Stevens, I. & Vecchio, A.
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/04/07 → 31/03/12
Project: Research Councils

Cite this

@article{f532e1c5021147f1a983b0d786e6c404,

title = "Variations of the amplitudes of oscillation of the Be star Achernar",

abstract = "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.",

keywords = "techniques: photometric, stars: oscillations, Be, asteroseismology, stars: activity, stars: individual: Achernar, stars: emission-line",

author = "Kym Goss and C Karoff and William Chaplin and Yvonne Elsworth and Ian Stevens",

note = "The definitive version is available at www.blackwell-synergy.com",

year = "2011",

month = feb,

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doi = "10.1111/j.1365-2966.2010.17665.x",

language = "English",

volume = "411",

pages = "162--166",

journal = "Royal Astronomical Society. Monthly Notices ",

issn = "1365-2966",

publisher = "SIPRI/Oxford University Press",

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}

TY - JOUR

T1 - Variations of the amplitudes of oscillation of the Be star Achernar

AU - Goss, Kym

AU - Karoff, C

AU - Chaplin, William

AU - Elsworth, Yvonne

AU - Stevens, Ian

N1 - The definitive version is available at www.blackwell-synergy.com

PY - 2011/2/1

Y1 - 2011/2/1

N2 - 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.

AB - 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.

KW - techniques: photometric

KW - stars: oscillations

KW - Be

KW - asteroseismology

KW - stars: activity

KW - stars: individual: Achernar

KW - stars: emission-line

U2 - 10.1111/j.1365-2966.2010.17665.x

DO - 10.1111/j.1365-2966.2010.17665.x

M3 - Article

SN - 1365-2966

VL - 411

SP - 162

EP - 166

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

IS - 1

ER -

Variations of the amplitudes of oscillation of the Be star Achernar

Abstract

Bibliographical note

Keywords

Access to Document

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Projects

Birmingham Astrophysics - Rolling Grant 2007-2012

Cite this