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

[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.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

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)

Language :

English

Title :

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

Publication date :

01 March 2013

Event name :

40th Liège International Astrophysical Colloquium. Ageing Low Mass Stars: From Red Giants to White Dwarfs

Event date :

9-13 juillet 2012

Audience :

International

Journal title :

EPJ Web of Conferences

ISSN :

2101-6275

eISSN :

2100-014X

Publisher :

EDP Sciences, Les Ulis, France

Volume :

Pages :

03008

Additional URL :

http://adsabs.harvard.edu/abs/2013EPJWC..4303008S

Commentary :

Available on ORBi :

since 20 June 2013

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