Reference : Amplitudes of solar-like oscillations in red giants: Departures from the quasi-adiaba...
Scientific congresses and symposiums : Paper published in a journal
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/150947
Amplitudes of solar-like oscillations in red giants: Departures from the quasi-adiabatic approximation
English
Samadi, R. [LESIA, CNRS, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195, Meudon Cedex, France;]
Belkacem, K. [LESIA, CNRS, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195, Meudon Cedex, France]
Dupret, Marc-Antoine [Université de Liège - ULiège > > >]
Goupil, M. J. [LESIA, CNRS, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195, Meudon Cedex, France]
Ludwig, H.-G. [Zentrum für Astronomie der Universität Heidelberg, Landessternwarte, Knigstuhl 12, 69117, Heidelberg, Germany]
Barban, C. [LESIA, CNRS, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195, Meudon Cedex, France]
Baudin, F. [Institut d'Astrophysique Spatiale, CNRS, Université Paris XI, 91405, Orsay Cedex, France]
Caffau, E. [Zentrum für Astronomie der Universität Heidelberg, Landessternwarte, Knigstuhl 12, 69117, Heidelberg, Germany; GEPI, CNRS, Observatoire de Paris, Université Denis Diderot, Place Jules Janssen, 92195, Meudon Cedex, France)]
1-Mar-2013
European Physical Journal Web of Conferences
43
03008
No
No
International
40th Liège International Astrophysical Colloquium. Ageing Low Mass Stars: From Red Giants to White Dwarfs
9-13 juillet 2012
[en] 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.
http://hdl.handle.net/2268/150947
10.1051/epjconf/20134303008
http://adsabs.harvard.edu/abs/2013EPJWC..4303008S
43

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