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 Barban C., Ludwig H.-G., Goupil M.J., Dupret M.-A., Belkacem K., Samadi R., Baudin F., Caffau E.
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Journal epj web of conferences
Year 2013
DOI
DOI not found
URL
http://dx.doi.org/10.1051/epjconf/20134303008
Keywords
physics

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