Communication Dans Un Congrès Année : 2013

Amplitudes of solar-like oscillations in red giants: Departures from the quasi-adiabatic approximation

Résumé

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.

Dates et versions

hal-03724429 , version 1 (15-07-2022)

Identifiants

Citer

Davoud-Reza Samadi, Kevin Belkacem, Marc-Antoine Dupret, Marie-José Goupil, Hans-Günter Ludwig, et al.. Amplitudes of solar-like oscillations in red giants: Departures from the quasi-adiabatic approximation. 40th Liège International Astrophysical Colloquium. Ageing Low Mass Stars: From Red Giants to White Dwarfs, Jul 2012, Liège, Belgium, Belgium. pp.03008, ⟨10.1051/epjconf/20134303008⟩. ⟨hal-03724429⟩
51 Consultations
0 Téléchargements

Altmetric

Partager

  • More