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

被引：5

作者：

Samadi, R. ^{[1
]}

Belkacem, K. ^{[1
]}

Dupret, M. -A. ^{[2
]}

Goupil, M. J. ^{[1
]}

Ludwig, H. -G. ^{[3
]}

Barban, C. ^{[1
]}

Baudin, F. ^{[4
]}

Caffau, E. ^{[3
,5
]}

机构：

[1] Univ Paris 07, Univ Paris 06, Observ Paris, LESIA,CNRS, F-92195 Meudon, France

[2] Univ Liege, Inst Astrophys & Geophys, B-4000 Liege, Belgium

[3] Heidelberg Univ, Zentrum Astron, D-69117 Heidelberg, Germany

[4] Univ Paris 11, CNRS, Inst Astrophys Spatiale, F-91405 Orsay, France

[5] Univ Paris 07, CNRS, Observ Paris, GEPI, F-92195 Meudon, France

来源：

40TH LIEGE INTERNATIONAL ASTROPHYSICAL COLLOQUIUM AGEING LOW MASS STARS: FROM RED GIANTS TO WHITE DWARFS | 2013年 / 43卷

关键词：

STOCHASTIC EXCITATION; STELLAR OSCILLATIONS; P-MODES; PULSATIONAL STABILITY; NONRADIAL MODES; CLOSURE-MODEL; CONVECTION; SIMULATIONS; GRANULATION; CONSTRAINTS;

D O I：

10.1051/epjconf/20134303008

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：10

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