Solar-Like Oscillations in beta Hydri: Evidence for Short-Lived High-Amplitude Oscillations
T. R. Bedding, H. Kjeldsen, I. K. Baldry, F. Bouchy, R. P. Butler, F. Carrier, F. Kienzle, G. W. Marcy, S. J. O'Toole, C. G. Tinney
Abstract
Velocity measurements of the G2 subgiant beta 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.
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