Amplitudes of solar-like oscillations in red giants: Departures from the quasi-adiabatic approximation
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ID: 97731
2013
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Abstract
CoRoT and Kepler measurements reveal us that the amplitudes of solar-like oscillations detected in red giant stars scale from stars to stars in a characteristic way. This observed scaling relation is not yet fully understood but constitutes potentially a powerful diagnostic about mode physics. Quasi-adiabatic theoretical scaling relations in terms of mode amplitudes result in systematic and large differences with the measurements performed for red giant stars. The use of a non-adiabatic intensity-velocity relation derived from a non-adiabatic pulsation code significantly reduces the discrepancy with the CoRoT measurements. The origin of the remaining difference is still unknown. Departure from adiabatic eigenfunction is a very likely explanation that is investigated in the present work using a 3D hydrodynamical model of the surface layers of a representative red giant star.
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| Authors | C., Barban;H.-G., Ludwig;M.J., Goupil;M.-A., Dupret;K., Belkacem;R., Samadi;F., Baudin;E., Caffau; |
| Journal | epj web of conferences |
| Year | 2013 |
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