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Solar-Like Oscillations in β Hydri: Evidence for Short-Lived High-Amplitude Oscillations

Published online by Cambridge University Press:  12 April 2016

T.R. Bedding ,
H. Kjeldsen ,
I.K. Baldry ,
F. Bouchy ,
R.P. Butler ,
F. Carrier ,
F. Kienzle ,
G.W. Marcy ,
S.J. O’Toole  and
C.G. Tinney
T.R. Bedding
Affiliation:
School of PhysicsA28, University of Sydney, NSW 2006, Australia
H. Kjeldsen
Affiliation:
Theoretical Astrophysics Center, University of Aarhus, Denmark
I.K. Baldry
Affiliation:
Anglo-Australian Observatory, Epping, Australia
F. Bouchy
Affiliation:
Observatoire de Genève, Sauverny, Switzerland
R.P. Butler
Affiliation:
Carnegie Institution of Washington, Washington, DC, USA
F. Carrier
Affiliation:
Observatoire de Genève, Sauverny, Switzerland
F. Kienzle
Affiliation:
Observatoire de Genève, Sauverny, Switzerland
G.W. Marcy
Affiliation:
Department of Astronomy, University of California, Berkeley, CA
S.J. O’Toole
Affiliation:
School of PhysicsA28, University of Sydney, NSW 2006, Australia
C.G. Tinney
Affiliation:
Anglo-Australian Observatory, Epping, Australia

Abstract

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Velocity measurements of the G2 subgiant β Hyi with both UCLES and CORALIE show a clear excess of power centred at 1.0 mHz. In the UCLES data we find evidence for a short-lived, high-amplitude oscillation event. If confirmed as a feature of subgiants, such ‘starquakes’ would make it harder to measure accurate mode frequencies and perform asteroseismology.

Type
Part 4. The Interaction between Convection and Pulsation
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 464 - 467
Copyright
Copyright © Astronomical Society of the Pacific 2002

References

Bedding, T.R., Butler, R.P., Kjeldsen, H., et. al. 2001, ApJ, 549, L105 CrossRefGoogle Scholar
Carrier, F., Bouchy, F., Kienzle, F., et al. 2001, A&A, 378, 142 Google Scholar
Kjeldsen, H. & Bedding, T.R. 1995, A&A, 293, 87 Google Scholar
Kjeldsen, H., Bedding, T.R., Frandsen, S., & Dall, T.H. 1999, MNRAS, 303, 579 Google Scholar